Wenger has confirmed he will definitely be missing Alexandre Lacazette after the striker picked up a groin injury in the win over Huddersfield on Wednesday night, while there were also doubts over Sanchez.
The Chilean left the field with a hamstring niggle but Wenger has said it is nothing serious and he should be fine to face Jose Mourinho's Reds side.
Wenger admits the loss of Lacazette is a blow, but is confident he has enough firepower within his ranks to put United to the sword and continue their fine recent run.
"Sanchez had a little hamstring problem - that's why I took him off but I think he will be alright," he said. "Look, we have offensive weapons, you know.
"We have Danny Welbeck, we have Giroud, we have Jack Wilshere who all came on. They are all offensive players. I will see what I do for Saturday but ideally you wanted him (Lacazette) there."