Flo has been included in United's squad for their final pre-season clash, ahead of next Saturday's League One opener away to Tranmere Rovers.
The 34-year-old former Norwegian international joined United in January and scored on his league debut in a 3-2 defeat by West Brom.
He suffered a broken foot in that game and has not played since. The much-travelled ex-Chelsea, Rangers and Sunderland marksman was out of contract at the end of last season, though Dennis Wise is understood to be keen to offer him a new deal.
Flo was due to make his comeback in United's friendly at York City last month, but was a late withdrawal from the squad.
Wise has yet to finalise his squad for the game, but other first-team squad members likely to feature include defender Scott Gardner and midfielder Robert Bayly.
The 34-year-old former Norwegian international joined United in January and scored on his league debut in a 3-2 defeat by West Brom.
He suffered a broken foot in that game and has not played since. The much-travelled ex-Chelsea, Rangers and Sunderland marksman was out of contract at the end of last season, though Dennis Wise is understood to be keen to offer him a new deal.
Flo was due to make his comeback in United's friendly at York City last month, but was a late withdrawal from the squad.
Wise has yet to finalise his squad for the game, but other first-team squad members likely to feature include defender Scott Gardner and midfielder Robert Bayly.