The Blades have completed the loan signing of Manchester United winger Lee Martin until the end of the season.

Bryan Robson has moved quickly to sign the 20-year-old, whose successful loan spell at Plymouth Argyle has recently come to an end.

"I spoke to Sir Alex (Ferguson) on Wednesday and he told me of the interest," said Martin on Thursday morning. "There were a few other clubs interested but it is good to know a big club like Sheffield United is interested in me.

"Plymouth wanted to extend my stay but the decision was made by myself and Sir Alex. I will work hard but hopefully I can bring a bit of flair, pace and energy."

Martin is predominantly a left winger and played in Plymouth's victory over the Blades at Bramall Lane in November and it was Robson's links with Manchester United that paved the way for the deal.

He has had previous loan spells at Royal Antwerp in Belgium, Glasgow Rangers and Stoke City and already knows faces in the Blades ranks:

"I've played with Phil Bardsley at Manchester United and Rangers and I was at Stoke with Lee Hendrie last season."

Martin, who has played twice in Manchester United's first team, is not cup-tied for the FA Cup but is suspended for Saturday's Championship encounter with QPR after picking up five bookings at Plymouth.