Rooney - v Persie
Mata
Di Maria - - - Blind
Carrick
Shaw - Rojo - Smalling - Rafael
De Gea
Blind to rotate with Fellaini/Herrera depending on the situation (and can also cover for Carrick obviously)
I maintain we'd be better with a diamond in midfield and four at the back - it would allow Mata, Di Maria, Rooney and RVP/Falcao to play in their best positions.
That said I'm not a football manager.
It's not unheard of - in 11/12 Liverpool loaned that Dani Pacheco to Ath Madrid and they loaned him to a lower division club within a few weeks. I'd imagine it has a lot to do with the terms of the specific lease.