"The crowd need to get behind this team they need to create a special European atmosphere," Scholes told ITV.
"I was lucky enough to play at Old Trafford and we always talked about the atmosphere on a Tuesday night, the special atmosphere you create, and the crowd is rocking when you go out for a warm up.
"At quarter past seven and there's empty seats everywhere.
On City, he added: "They've got the team, they've definitely got the players, the quality is definitely there, but do the crowd realise how lucky they are to be in this competition? I don't think they do."
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