The Etihad Stadium skipper was dismissed for a challenge on Nani in the FA Cup defeat to Manchester United on Sunday, which Mancini’s men have appealed against.
Kompany will find out whether the appeal has been successful or not on Tuesday, and if the red card is upheld will face four matches on the sidelines, as it is his second dismissal of the season.
The Telegraph indicate that Mancini has approached the club’s owners for additional transfer funds to buy a new defensive player in January.
As Kolo Toure is also unavailable through international commitments at the African Cup of Nations, Joleon Lescott and Stefan Savic are the club’s only recognised centre backs available for selection currently.
Meanwhile, City are being linked with a move for Real Madrid centre half Raul Albiol in an attempt to bolster their backline, according to Spanish newspaper AS.
The Spain international as been frozen out at the Santiago Bernabeu, and risks missing out on Euro 2012 if he does not play more first-team football in the second half of the 2011/12 campaign.
Big-spending Malaga and Serie A giants Juventus have also been speculated with a bid for the 26-year-old.
By Gareth McKnight