West Ham United have seen an offer for the left-back turned down.
The agent of Norwich City left-back and West Ham United target Martin Olsson has told Fotbollskanalen that it is "not acceptable" that the Canaries are denying the player a move back to the Premier League.
Olsson has emerged as a primary target for the Hammers to reinforce the left side of defence after Aaron Cresswell suffered a long-term injury blow in pre-season last month.
The Olympic Stadium club are thought to have had a bid worth around £3 million for the Sweden international turned down, with the Canaries allegedly holding out for over £5 million.
However, Olsson has just a single year left on his contract at Carrow Road, and the relegated club risk losing the 28-year-old for nothing in a year's time if they are unwilling to cash in.
The agent of the left-back, Hasan Cetinkaya, has had some strong words for Norwich, claiming that the East Anglia club have backtracked on an agreement to sell the player, and insisted that the Canaries' stance on a deal is unacceptable.
Cetinkaya told Fotbollskanalen: "It is true that they [Norwich] received multiple bids, both from other clubs abroad and also in the Premier League. There are clubs who have put very [good] bids, especially considering that it’s only a year left on the contract. Norwich tries to stop the transfer, it is the fourth time now.
"We had an agreement on a sum – now Norwich want even more. It does not work quite so in football. Martin has been loyal to Norwich. It is not acceptable that they do [not sell].
"Martin is very clear that he does not want to play in the Championship and he wants to take the next step. He would particularly like to play in the Premier League, when he was so good in the Championship too. Martin is not a Championship player. But we do not give up. We are optimistic."
Though he did not mention West Ham's interest specifically, it is thought that the London club are the preferred destination for Olsson this summer.
Whether or not he will be granted his move remains uncertain, but West Ham will likely be willing to up their offer to secure a quick deal as they search for cover at left-back before the season opener next weekend.