Marchisio got the decisive goal in the second half with a sensational Leo Messi-style piece of footwork.
Ferrara said: "Marchisio is a very professional lad who doesn't let it go to his head. He was coming off a tough time with the injury, was cross as he lost [Samuel] Eto'o on the goal and wanted to make up for it with a fantastic strike."
"I'm happy for Martin, he was a bit lost at the start in a very new environment, but is now proving he has great strength, power and grit. I like him as a player and he's doing very well."