Rooney returns to Doha after featuring in England's 1-0 friendly defeat by Brazil in November. The Doha academy regularly hosts training camps for clubs and national teams.
The club, meanwhile, is planning to refinance its huge debt with a bond sale it hopes will raise £500 million (Dh2.96 billion.
The bond sale could significantly reduce the interest United pays on the debt American businessman Malcolm Glazer took on to buy the Premier League club for £790 million in 2005.
United released annual results on Monday showing it paid £41.9 million in interest on bank loans for the year ending June 30, 2009.