Campbell was again impressive in yesterday's victory against West Ham United.
Wenger told arsenal.com: "Sol Campbell was outstanding but to repeat the games could become a problem for him so I think I have to give him a big holiday next week to recover. He is very important to us and I think it was a very good signing.
"Everybody said I didn't sign anybody and now you can see that I signed somebody. His experience is vital in the dressing room. You need it especially when we get to the period we are in, it's important you have players like Campbell and Almunia who are very influential. They have done it before so players listen to them."