Tuchel hopes Chelsea's Kovacic can play through pain in FA Cup final
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Kovacic limped out of Wednesday's 3-0 win at Leeds after being caught by Daniel James in a tackle that led to the winger's dismissal.
Despite having a heavily swollen ankle, Kovacic planned to train on Friday in an effort to show he is ready to face quadruple-chasing Liverpool this weekend.
"Mateo wants to try it and the medical department gave the green light to try it.
"The ligament is anyway stretched from the last incident, so there's no new injury but heavy pain, and it's heavily swollen.
"We're hoping that maybe time is enough that he makes it."
The Blues have lost the past two FA Cup finals against Arsenal and Leicester, while also suffering a penalty shoot-out defeat to Liverpool in the League Cup final in February.
"The quality and personality, his dribbling, carrying the ball, driving with the ball is excellent, a top team player."
Lukaku has endured a difficult season following his £97 million ($118 million) move from Inter Milan, although he has scored three goals in his last two games to push for a place in the team at Wembley.
And now the Belgian striker's agent Federico Pastorello has told the Italian media he wants to speak to Chelsea's new owner Todd Boehly about a potential move back to Serie A.
"If he plans to talk with the owner maybe it's not his plan to talk with me, so fair enough. Let's see if he gets a meeting and he can get to talk, that's his right," Tuchel said.
"That's what it is sometimes in football, the attention is so high that sometimes it attracts situations that you don't want to have before big matches. But that's the way it is.
"For me it's not a distraction and hopefully for everybody who works for the team, and the player himself."