Wolves manager Bruno Lage admits he is worried about a lack of goals from his side.
The Molineux outfit have scored just three goals from seven matches this season, leaving them two points from the relegation zone.
"When you don't score goals, it's a worry," Lage told the Express & Star.
"That's why we have these three strikers but unfortunately no-one is available to play.
"Even City are so strong but understand they need a reference in the box to score goals. If Man City can play really well without a striker, for us it's more important to have that man.
"Raul didn't do pre-season. When he came he played three games in a row because we didn't have any solutions. After the Bournemouth game he cannot play because he was so tired and with his problem.
"We put Sasa in the game and he just played 45 minutes. After that, we talked with Diego to come but he needs time.
"We need to find different solutions. It's hard to have three strikers like we have and have no-one available."