The Premier League leaders have won just two out of their last five league games, including defeat at Aston Villa on the weekend.
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For the moment, defenders Gabriel Magalhaes, William Saliba and Cristhian Mosquera are all out, as is forward Kai Havertz.
Timber said: "Yes, it is (affecting us). I think we have a great squad. I think players that come in always do really good, but obviously it's not always easy.
"We can't play every week with the same players and if players go out again, it's tough. But I think it's also part of... it happens within the season.
"I think it happens at every club. With us it's the same and we just have to manage that with and win our games."