McAnuff told BBC Berkshire: "Everyone's come back flying and the fitness levels are unbelievable - the best I've seen at a club in a pre-season.
"There's a buzz about the place off the back of last season - we finished well to bring momentum into this season."
After the match against Red Star Belgrade, Reading head to Croatia to play top flight side Inter Zapresic, on Saturday, 17 July.
The final match is on Tuesday, 20 July against Slovenian side NK Celje.
McAnuff says after the tour, the team will be raring to start their Championship campaign.
"We've had a good break and I've managed to get my feet up for a little while," he said.
"But after a month you're really looking to get back into it, get the pre-season out of the way and now I'm just really looking forward to the start of the season."
Source: BBC Sport
Source: BBC Sport