Sydney have confirmed their interest in Collingwood defender Tom Langdon, as he continues to weigh up his future.

Langdon is still without a contract for 2019, despite an impressive finals series.

Sydney's Head of Football Tom Harley spoke to reporters on Wednesday, and confirmed the Swans' interest in Langdon.

"He flew to Sydney yesterday and had a medical," Harley said.

"We spoke to (Magpies list manager) Ned Guy about that on Monday, so we've been transparent with Collingwood.

"I think the incumbent club's always got the whip hand in that sense. We're just waiting for the finer details from that medical at this stage."

If the 24-year-old does in fact choose the Swans, Harley believes it'll free up space for Callum Mills and Zak Jones to move into the midfield.

"I think (Langdon's) obviously had a good first four years to his career. Clearly his finals performances grabbed our attention. It wasn't just that (though)," Harley said.

"We've attacked this trade period with specific needs and we think we can add to our back half, which might free up some of our young, developing half-backs who we think are mids – Jones, Mills, those types."