Lee Mair has been attracting interest from English clubs

Oxford United are said to be interested in defenders Mair and Mackay, with the former also linked with Stockport.

Duffy said: "After talking to their agents, it seems like they could be moving on.

"But we have left the contract offers open to them and I would be delighted to take them back."

Duffy was speaking after signing central defender Bobby Mann from Inverness Caledonian Thistle and announcing a new deal for versatile captain Barry Smith.

I know both players and they're at the right age Oxford boss Graham Rix

"We were short of cover in defence at the end of the season and now look to be losing Lee," said Duffy.

"But, as long they are committed to Dundee, I would be delighted to take the three boys back if they can't get the deals they want elsewhere."

Oxford boss Graham Rix is familiar with the talent at Dens Park, having coached at the Scottish Premier League club earlier in the season, and is particularly interested in Mair and Mackay.

Dundee sign two skippers

"I know both players and they're at the right age," said Rix.

"I'm in talks with my chairman and we'll see what happens."

Stockport have reportedly made an attractive offer to Mair, Dundee's bargaining power being reduced because they are presently in administration.

Mackay and 23-year-old Mair have been regulars this season, while striker Milne, who like Mackay is 24, has still managed eight goals in a season curtailed by injury.