Former Swansea City striker Dean Saunders is disappointed the club did not re-sign Joe Allen from Liverpool.
Wales midfielder Allen. 26, has joined Premier League rivals Stoke City, managed by ex-Wales boss Mark Hughes, on a five-year deal.
Liverpool accepted Stoke’s £13m offer for Allen after rejecting an £8m bid from the Swans in June.
Saunders explained Sir Alex Ferguson has been lauding Allen for his performances for Wales during Euro 2016.
Allen was named in the team of the tournament after helping Wales to the semi finals in their first major finals appearance in 58-years.
“I was speaking to Sir Alex Ferguson and he said ‘What about Joe Allen’s performances in the Euros? What a player he is’,” he told BBC Radio Wales Sport.
“He never mentioned Aaron Ramsey or Gareth Bale. We have missed out, the Swans have missed out, we should have got him back.”
Allen, who moved to Liverpool from Swansea in 2012, only had one year left on his contract at Anfield.
Swans chairman Huw Jenkins had suggested the Welsh club would match Stoke’s £13m offer.
“It is a disaster for Swansea. Mark Hughes knows him but I am disappointed as a Swansea fan,” Saunders continued.
“He is a great player.”
Allen’s former Swansea and Wales team-mate, ex-midfielder Owain Tudur Jones, shared Saunders’ view.
“I am gutted for Swansea. They have missed a trick,” Jones told BBC Radio Wales Sport.
“He’s certainly a player that could have added to their squad for years. He would have been a player that they would have got in his prime.
“Joe is a guy who could potentially have come in as a future captain.
“Stoke are a good progressive club with a manager that’s trying to do things the right way.
“I would assume the only reason they would sign him is because they want to use him and use him in the middle of that park.
“It’s going to be a good move for him.”