Chelsea defender Thiago Silva is set to miss the game against Sheffield United this weekend after injuring his thigh in the London derby on Thursday night.
The Brazil international Silva off in the first half after stretching for the ball. He was replaced by Andreas Christensen.
"It will be very tight for Sunday, only two days recovery," Tuchel said. "It is too early to give a diagnosis because I saw him very briefly with a big strap around his muscle.
The Emirates FA Cup
Tuchel hype train slowed by FA Cup final defeat that exposed Chelsea weaknesses
18 HOURS AGO
"We will have to wait until Friday so we can confirm it but I think for Sunday he is a big doubt."
Jorginho's 24th-minute penalty sealed the victory for Chelsea and lifted them into sixth spot with 36 points from 22 games.

Mbappe 'really wants to go to Madrid' says ex-teammate - Euro Papers

The Emirates FA Cup
'Indescribable, sensational' - Schmeichel on Leicester's FA Cup glory
19 HOURS AGO
The Emirates FA Cup
Tielemans rocket gives Leicester famous FA Cup triumph
A DAY AGO