Celtic were thrashed 4-0 at home by Bayer Leverkusen on Thursday night in a Europa League game that left them bottom of their group in the tournament.
Ange Postecoglou is an attacking manager and has vowed that he is not going to change his style despite conceding eight goals in their opening two Europa League group games.
But Ferguson indicated that it is foolish to be that gung-ho when playing against top teams and sometimes it is better to accept that the opposition are stronger and the team would be served better if they are a bit more pragmatic and defensive.
He pointed out that Leverkusen are a Champions League quality team and Celtic should feel hurt by their performance on Thursday night.
Ferguson said on the Go Radio Football Show: “Let’s be honest when you come up against top opposition sometimes you have got to admit that.
“When you come up against better players, sometimes it is better to sit in, be compact, take the game as long as possible into the final third and hopefully you can get something towards the end.
“Let’s be honest, Bayer Leverkusen are a Champions League team.
“They have a team who are sorted and they have players who can hurt you.
“So, that was a sore one for Celtic.”
Celtic have a big game lined up on Sunday when they will visit Pittodrie to take on Aberdeen in the league.