The London club completed the signing of the Brazil international and Champions League winner from Serie A side Inter Milan, and Hughes is delighted that he now faces a selection headache.
|CISSE TO STRIKE?|
|12/1||Djibril Cisse is 12/1 with William Hill to score first against Manchester City|
"How do I keep both keepers happy? It's different for them I admit, but injuries and suspensions will always be there, and performances will decide who plays well enough to keep their shirt."
Green only made his debut on the opening day of the season but suffered an embarrassing first day defeat as the Hoops were thrashed 5-0 by Swansea City, and was at fault for the opening goal.
The 32-year-old made the move across London from West Ham during the summer, and now looks set to lose his place in the first team.
The arrival of Cesar is the latest of a number of high profile signings for the outfit, who are looking to strengthen the squad following the threat of relegation last season.