Charlie Adam has told talkSPORT that Everton could make the best signing of the summer if they bring Ashley Williams to Goodison Park.
If and when he signs, Williams will be John Stones's replacement after the young centre-back, 22, joined Manchester City in a £47.5 million switch on Tuesday.
Ashley Williams celebrates scoring the second goal for Swansea City
Williams is an established and experienced central defender who has been a rock for the Swans these past eight years - five of which were in the Premier League - and he is arguably a better, more reliable player than Stones, in the short term anyway.
And Adam believes it's a fine bit of business by Everton boss Ronald Koeman if the deal materialises, the Stoke City midfielder saying it could be one of the best purchases of the summer.
Charlie Adam scores the first goal for Stoke City
"It's an excellent replacement for Everton. I think it could be one of the best signings of the summer. It's a fresh challenge for him," he told talkSPORT.
"He's been at Swansea a long time and to play under Ronald Koeman is a great move for him."
Everton have also been linked with a move for Sunderland centre-back Lamine Kone, according to ESPN, but that one does not appear to be as far along as Williams's prospective switch.
Everton Chairman Bill Kenwright and new manager Ronald Koeman pose