Millwall have signed Jason McCarthy from Wycombe for an undisclosed fee.
McCarthy, a former Southampton academy product, can play as a right back and centre back - and will provide competition for Mahlon Romeo.
The ex-Barnsley man made 49 appearances in all competitions last season, featuring primarily as a right back. He scored three goals and made three assists in the entire campaign.
The deal sees Fred Onyedinma move the other way after his two successful loan spells with the Chairboys.
He becomes Neil Harris’ eighth summer signing following the arrivals of Frank Fielding, Alex Pearce, Jayson Molumby, Connor Mahoney, Tyler Burey, Matt Smith & Jon Dadi Bodvarsson.
Millwall are still chasing another goalkeeper, with Bartosz Bialkowski expected to sign on a season-long loan deal from Ipswich. Tom Elliott could also join Paul Lambert’s side for the season.
Danny McNamara is also set to sign for Newport on loan.
Image: Millwall FC