Ferguson told the Daily Mail: "It is certainly an unusual build-up to a game but it hasn't affected our preparations at all, we are preparing in the usual way.
"I'm sure it may disrupt them but we were only made aware of it this morning.
"I believe Chris Samba and David Dunn didn't travel on Saturday and maybe two or three others have symptoms but I'm sure the game will go ahead.
"I don't know what team they will play anyway. They lost 5-0 at the weekend and play Manchester United on Saturday so there is every chance that they will make changes regardless.
"We'll have to wait and see but we go there with the belief that we can get a result."