Callum Styles has left Barnsley for Sunderland on loan with an option to buy in the summer.
The 23-year-old Hungary international has been keen to move to the Championship as he looks to keep his place in the national team ahead of this summer’s Euros.
The move was complicated by a recent illness for the midfielder.
Styles has played more than 150 games for the Reds, since signing in 2018, including 20 in League One this season, with three goals.
Interim director of Football, Bobby Hassell, told the club website: “Callum expressed a desire to leave the club and play at a higher level in the second half of this season.
“We respected Callum’s wishes, which we felt was beneficial for all parties as we look to push on and achieve our goals for this season at Barnsley.”
