Sunderland face competition from Premier League rivals Everton for the signature of highly-rated Leeds defender Sam Byram.
The Toffees are monitoring the situation as a result of ongoing speculation concerning the future of Republic of Ireland international Seamus Coleman, who is wanted by Manchester United.
Byram, who is comfortable at right-back and on the right wing, is wanted by Sunderland head coach Dick Advocaat as he looks to revamp his squad.
The players return to training tomorrow and the Black Cats are yet to make a signing.
Everton have insisted neither Coleman or John Stones are for sale but the Red Devils are understood to be keen to take Coleman to Old Trafford.
That could pave the way for an Everton bid for Byram.
Sunderland have agreed a loan fee of £2.5m for Arsenal defender Carl Jenkinson, but the right-back is also wanted by West Ham United, who remain the favourites to sign him.