MANCHESTER -- Manuel Pellegrini does not know when Vincent Kompany will return from injury as the Manchester City captain recovers from another calf strain.
Kompany has made just 12 appearances this season and has not started a game since the Champions League victory over Sevilla on Nov. 3.
He came off the bench against Sunderland on Boxing Day but lasted just nine minutes before limping off with a recurrence of the injury.
"It's difficult, because Vincent is doing a lot of different things to try to understand and find the reasons why he has so many injuries," Pellegrini said.
"In this moment, it's difficult for me to tell you an update about that. Vincent maybe not so soon, but for the last part of the season, he could be fit. So at this moment, we are not thinking about making a change."
Kompany has admitted his frustration after the latest setback -- the 13th time he has suffered an injury to his calf.
City have suffered without his experience and leadership at the back. The 29-year-old has started eight Premier League games and City have conceded just one goal with him on the pitch. But in the 11 games hasn't featured, City have shipped 21 goals and kept just one clean sheet.
Fellow centre-half Eliaquim Mangala is also ruled out of Wednesday's game against Everton at the Etihad while Pellegrini also revealed that Fernandinho will miss the game with a "small muscle injury."
City are set to start with the defensive pairing of Nicolas Otamendi and Martin Demichelis and Pellegrini has warned his side to be aware of the Toffees.
Everton beat City 2-1 in the Capital One Cup last Wednesday, in the first of three meetings in January, and Romelu Lukaku, who headed in the winner, is expected to return after being rested for the FA Cup win over Dagenham & Redbridge.
Pellegrini said; "Everton have a style of play that is attacking under their manager Roberto Martinez. He has players who are in a very good moment, so we must be very careful with their counter attack.
"If we need to rely on Lukaku to be injured to win, then we are not a better team than Everton. I am sure we will have a good day and a normal performance.
"It will be a very tough game, but I think we can beat them here at home with or without Lukaku."