Doncaster Rovers have signed defender Ollie Younger from fellow League One side Sunderland on an 18-month deal.
Younger has also spent time on loan at St Patrick's Athletic.
The centre-back - Doncaster's third signing of the January transfer window - arrives at a Rovers side bottom of the table, who have conceded 49 goals in 26 league games this season.
Find all the latest football transfers on our dedicated page.