Sigurdsson has impressed since arriving at Swansea on loan where he has netted seven goals in 14 games. He suffered an injury-hit time at his German parent club Hoffenheim, leading to speculation that the Iceland international is ready for a permanent move to the English league.United have lacked a creative spark in the centre of their midfield this season and see the former Reading playmaker as a cheaper option than Luka Modric or Wesley Sneijder.
Sir Alex's right-hand man Mike Phelan and chief scout Martin Ferguson watched Swansea’s draw with Bolton, and the United boss was at the Liberty Stadium himself on Saturday as the Swans were held 4-4 by relegated Wolves. He will get another look at his target next week when United face Swansea.
Hoffenheim value Sigurdsson at £10m, but the Germans may up their asking price if United make their interest solid with an offer for the 22-year-old.