It has been suggested that Sanchez could hand in a transfer request to force a move to Manchester City, while Paris Saint-Germain have also been in the hunt.
Courtois said: “Alexis is a guy with a lot of quality. If you see all the games from last season there is a lot of danger coming from him.
“He has a very strong shot, he is quick. He has the technique. He is important for them but Arsenal have a lot of players with quality.
“So they will miss him but I think they have a lot of players with that quality to replace him. I think they have bought a good new striker (in Lacazette).
“I’d prefer if he (Sanchez) doesn’t play because he is a good player! But we cannot only look to him.
“So you cannot look to the team as one player or another player. It will be a difficult game regardless but I hope for the same outcome as the friendly last week.”
Source: Tribal football