The Frenchman will start in Arsenal's Champions League clash with Olympiacos.
"He doesn't get enough praise for his attitude and his quality," said Wenger of the 32-year-old. "Silvestre's commitment to the cause was absolutely fantastic at Man City.
"People respect him highly in the dressing room. He's a quiet leader.
"He is a positive guy and helps the young players, but of course the best help is to win the games."