The 'Us' have inquired about the availability of three Posh strikers, believed to be Liam Hatch, Scott Rendell and Crow.
The Blue Square Premier League Club are keen to sign a forward on loan before the start of the season.
Posh manager Darren Ferguson has ruled out the possibility of Rendell returning to his former club and of Hatch joining a club who tried to sign him last summer, but he is keen to unload Crow.
Ferguson said: "Cambridge have shown an interest in three of our strikers, but Danny is the only one I would be prepared to let go.
"I would be happy for him to leave on loan or on a permanent basis, but I haven't spoken to him about it yet. I'm not interested in letting any of our other strikers leave."
Cambridge are under new management this season with Gary Brabin and former Posh midfielder Paul Carden in charge at The Trade Recruitment Stadium following the departure of another old London Road favourite Jimmy Quinn.
The 'Us' have lost many members of the squad that reached the Blue Square Play-off Final last season, but they would have to work hard to persuade Crow to drop out of the Football League.
Crow is unlikely to travel with the first-team squad to their Marbella training camp at the weekend. The other transfer-listed players – Mark Tyler, Josh Low, Shwan Jalal, Adam Smith and Danny Blanchett – are also not expected to travel.
Potential new signing Mark Jones will also miss the trip as he recovers from a fractured cheekbone.
The midfielder is now expected to arrive at London Road in a fortnight for a thorough medical before completing his free transfer move from Wrexham.
Posh open their pre-season friendly programme with a match against a Liverpool XI at London Road on Saturday, July 19 before travelling to Stevenage on Tuesday, July 22.
Other friendlies: Saturday, July 26, Rushden & Diamonds (away); Tuesday, July 29 v West Ham (home); Saturday, August 2 v Corby (away); Monday, August 4 v Manchester United (home).
Posh have sold more than 6,500 tickets for the match with Champions League and Premier League winners Manchester United.
Admission prices are set at the same rate for a normal Football League match and are available from a 24 hour hotline on 0844 8471934 and
www.theposhtickets.com.
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