Chelsea head coach Antonio Conte is unconcerned if being substituted makes Eden Hazard unhappy, stating his priority is to win matches.
Hazard missed pre-season after fracturing his ankle while on international duty with Belgium in June, and did not make his first appearance of the campaign until September 9.
The 27-year-old, who last week stated he would commit his long-term future to Chelsea despite reported interest from Real Madrid, has completed a full 90 minutes in just eight of his 28 outings in all competitions this term.
Supporters booed when Hazard was substituted before the hour mark in Saturday's 0-0 draw against Leicester City, but Conte assured he is trying not to overwork the Belgian.
Conte says he took Hazard and Fabregas off because they were tired, and the introduction of the fresh Pedro and Willian helped our attacking play. #CHELEI— Chelsea FC (@ChelseaFC) January 13, 2018
"We're talking about a player that recently had a bad injury in his ankle and had surgery, when you have this type of situation you must pay great attention because you can have ups and downs," he said ahead of Wednesday's FA Cup third-round replay against Norwich City.
"He missed the pre-season with us, too. With him we are trying to find the best way. It's normal that one player can't always be on top form. But my task is to try to improve him and try to put him in the best physical condition and make the best possible decision for the team."
Asked if Hazard agreed with that approach, an irritated Conte replied: "This is not important. I am the coach, I decide. It is not important if the player is happy or not, only here [in England] is there this situation.
"You are very worried about whether a player is happy or not. This is not important.
"My first task is to do the best for the player and for the club, not to make every single player happy. Otherwise we'd risk finishing 20th in the table.
"Every press conference there is always this question about whether I'm worried about making my players happy. No. I'm worried about winning."
After an impressive start to life at Stamford Bridge, Alvaro Morata has struggled in recent weeks and is without a goal in five games.
When things don't go as expected there's only one way... Work hard!— Álvaro Morata (@AlvaroMorata) January 3, 2018
Se nos escaparon los tres puntos... Cuando las cosas no salen como uno espera, solo hay un camino... trabajar, trabajar y trabajar. pic.twitter.com/uBcVFLqEOk
Conte feels the former Real Madrid man needs to have more faith in his ability to bring the slump to an end.
"It's normal when your striker doesn't score, you are a bit frustrated," said the Italian.
"He had chances to score. In this period he was a bit unlucky, he has to continue work and improve.
"He has to continue to trust in himself. It is important also that his team-mates trust him. We'll see if this situation can change."
|It needs to take 30 seconds – Matic wants quicker VAR|
|Gattuso: My job is to be the players´ nightmare until season´s end|
|I wasn´t good enough – Guardiola reveals Wigan rejection|
|Brazilian derby between Vitoria and Bahia abandoned after red-card frenzy|
|It was crazy, but I like that - Zidane revels in eight-goal Betis thriller|
|Asensio credits Zidane for Madrid´s thrilling Betis comeback|
|Zidane hopeful over Marcelo hamstring injury|
|Bonaventura claims Milan can catch Inter|
|Bravo for Claudio! Guardiola to pick keeper at Wembley|
|Mourinho hoping for reinforcements at Sevilla|
|Real Madrid become first side to score 6,000 goals in LaLiga|
|Real Betis 3 Real Madrid 5: Asensio at the double in LaLiga classic|
|AC Milan 1 Sampdoria 0: Bonaventura makes it 10 unbeaten for Rossoneri|
|Schurrle excited to finally link up with Reus and Gotze|
|Real Madrid defender Marcelo suffers hamstring injury|
|Costa fumes referees ´want to give me a card´, but Simeone plays down penalty row|
|Stoger makes Dortmund history with Gladbach win|
|Championship Review: Leeds fight back for point, Norwich & Ipswich share derby spoils|
|Borussia Monchengladbach 0 Borussia Dortmund 1: Burki unbeatable as Reus returns to haunt Foals|
|FA Cup ´magic´ no surprise to Pochettino after Rochdale thriller|
|Rochdale hero Davies: This is every kid´s dream|
|Atletico Madrid will not stop in pursuit of Barcelona, promises Gameiro|
|´Wrong image´ to blame for VAR confusion in Manchester United´s FA Cup win|
|Rochdale 2 Tottenham 2: Davies denies Kane in FA Cup classic|
|Atletico Madrid 2 Athletic Bilbao 0: Gameiro and Costa settle cagey clash|
|Napoli set club record with another Serie A win|
|Napoli 1 SPAL 0: Allan sends hosts top of Serie A again|
|Allegri allays Higuain injury fears|
|Allegri convinced Juve can get past Spurs|
|Everton fear ´long-term´ injury for Mangala|
|If it isn´t Madrid, it´s Paris - Hazard tires of speculation|
|Torino 0 Juventus 1: Champions win derby but lose Higuain|
|Neymar exit made Barcelona stronger - Ter Stegen|
|Injured Higuain forced off against Torino|
|Jesus confident of returning strong after knee injury|
|We had to change hotels – Ovrebo recalls fury after 2009 Chelsea-Barcelona semi-final|
|Spalletti: Inter board will decide my future|
|Fabregas still wary of timeless Iniesta|
|Liverpool´s 30-goal hero Salah: There´s more to come|
|Valverde: Coutinho dropped for the good of Barcelona|
|Ronaldo better than Neymar? No says Xavi|
|Real Madrid hurt you with nothing – Xavi says PSG loss an injustice|
|Conte: Chelsea need perfect game to stop Messi and Barcelona|
|Inter in a fragile moment, says Spalletti|
|Booed Emery praises PSG´s mental strength|
|Cavani hails ´good reaction´ as PSG bounce back in style|
|Mourinho wants referees to have final say on VAR|
|Genoa 2 Inter 0: Pandev piles misery on old employers|
|Manchester United to host Brighton in FA Cup quarter-finals|
|Mata ´still up for VAR´ despite disallowed goal at Huddersfield|
|Valverde: Barcelona had to suffer at Eibar|
|Championship Review: Fulham end Villa run, Cardiff pounce|
|Huddersfield Town 0 Manchester United 2: Lukaku sends visitors through after VAR controversy|
|Bayern Munich boss Heynckes hails game-changing Muller|
|Locadia benefiting from ´competitive´ Brighton - Hughton|
|Baby on board? Alba dedicates Barca goal to girlfriend|
|West Brom future ´not a decision for me´, says Pardew|
|Paris Saint-Germain 5 Strasbourg 2: Cavani at the double in bounce-back win|
|Bar-celona! Messi posts unwanted record|
|Barca go 31 LaLiga games unbeaten to tie club record|
|Mourinho: I don´t know and I don´t care when Pogba returns|
|Brighton and Hove Albion 3 Coventry City 1: Locadia, Ulloa lead Seagulls to quarter-finals|
|EIbar 0 Barcelona 2: Suarez and Alba seal points as Orellana sees red|
|West Brom 1 Southampton 2: Rondon stunner in vain as Baggies drop out|
|Wolfsburg 1 Bayern Munich 2: Lewandowski spot-on after Robben´s penalty miss|
|I hope Cutrone finds a beautiful girlfriend so he can rest and make love - Gattuso|
|Allegri denies Champions League ´obsession´ ahead of Turin derby|
|Barry, Evans start for West Brom after training camp incident|
|Sheffield Wednesday 0 Swansea City 0: Carvalhal settles for replay on Hillsborough return|
|Management ´tiring´ but Zidane not ready to leave Madrid just yet|
|Thiago back for Bayern as Heynckes rests stars for Besiktas|
|Simeone urges Atletico fans to get behind Griezmann|
|Robben amazed by Guardiola´s impact at Manchester City|
|Pogba out of Man Utd´s Huddersfield trip with illness|
|A-League Review: Perth ´Panenka´ punished, 10-man Adelaide rescue late draw|
|Robben targets two more years at the ´highest level´|
|Rashford and Herrera ´have a chance´ of making Sevilla trip|
|Emery defends PSG star Neymar after Madrid display|
|Mahrez saga now over, says Leicester boss Puel|
|Alonso to return for Barca clash but Bakayoko set to miss first leg – Conte|
|Mourinho: Manchester United will sign a midfielder|