Chelsea boss Jose Mourinho says midfielder Oscar recovered from the head injury suffered against Arsenal on Sunday.
The Brazilian collided with goalkeeper David Ospina in the first half of the game and was taken off as a precaution at the end of the first half.
The 52-year-old also revealed that he will not take any unnecessary risks over striker Diego Costa.
"I really don't know how Oscar is, but the most important thing is that he is not in hospital," Mourinho said.
"He went immediately to his house yesterday, slept at home, and he should be arriving [today].
"I don't know about Diego Costa. I have to think about if it deserves a gamble or if we wait a few more days to be completely sure.
"If it was a player without an injury history I would play him tomorrow, but because he is a player with a history I have to think about that.
"I don't plan to make many changes. I know Leicester played on Saturday and we played on Sunday, but we will try to recover the players as best we can. We go today to St George's to prepare as best we can.
"We will leave the young players here to play their cup final against Man City so we don't take them with us. Our squad is very short with the injuries we have and so there is no space for a lot of rotation."
The Portuguese also previewed Wednesday's game against Leicester City during his press conference.
"I was surprised with their bad position. They are a good team with good players," he explained.
"I played them very early in the season at Stamford Bridge, and I could immediately feel the quality of the team.
"I am not surprised they are out of the relegation zone, and I will not be surprised when they stay in the division.
"They have lots of players. Their squad is a good squad, with options for every position, and they are playing well. They have more matches at home than away, at home to teams in the same area as them. The game against Chelsea is an extra game for them.
"If we can get one point or three points on Wednesday it would be very good for us."