Meanwhile, Edu is likely to have left before Arsenal play United, with the 26-year-old failing to reach agreement over a new contract.
Arsenal have resolved to sell the Brazilian before this month's transfer window closes rather than losing him on a free transfer at the end of the season when his contract runs out.
Spanish club Valencia are the favourites to sign the midfielder but he is unlikely to cost anything like the £6million Arsenal paid Corinthians in 2001.
Edu admitted on his website: "I have already decided not to stay with Arsenal."