Manchester United chief David Gill has welcomed Michael Owen's arrival.
Gill told MUTV: "Sir Alex is the best person to measure that, but watching from the sidelines I've been delighted. He's enthusiastic and very happy to be here.
"We'd discussed signing him for a while - we were aware that he was out of contract at the end of the season, so he was someone we kept an eye on. I hope he'll prove to be a great signing for us."