Massimiliano Allegri said he was lucky to have such a big squad as Thiago Silva became the latest player to break down with injury, virtually ruling him out of Wednesday’s Champions League clash with Barcelona.

The Brazilian lasted only 10 minutes of Saturday’s 2-1 win at Roma before hobbling off with a muscle problem in his leg. Allegri said afterwards it would be almost impossible for his centre-back to be fit to face the European champions at the San Siro.

Daniele Bonera switched from full-back into the centre and formed a solid partnership with Philippe Mexes, earning praise from Allegri.

“I think it will be impossible for him (Silva) to play on Wednesday, he has an injury,” said Allegri.

“Fortunately we have a big squad of 33 players, some of whom have found consistency by playing more regularly. Bonera is doing very well, both in the centre and at full-back.

“I wanted to take the risk (with Silva) because it was a vital match, the league is as important as the Champions League and as I don’t have many full-backs I wanted to rest Zambrotta (who replaced Silva).”

Allegri was already missing the likes of forwards Robinho, Pato, Antonio Cassano and Maxi Lopez as well as full-backs Ignazio Abate and Luca Antonini and defensive midfielder Mark van Bommel.

Kevin-Prince Boateng was only fit enough for the bench and the crisis left Allegri scratching his head to find a reason for why so many of his players are out injured.

“It’s not good that with a month to go in the season we have so many injuries, now is the time that you make a difference,” he moaned.