Arsenal defender Sead Kolasinac is joining Schalke on loan for the rest of the season after Gunners boss Mikel Arteta said offloading players was the January transfer window "priority".
Bosnia-Herzegovina left-back Kolasinac, 27, began his career with the German side before moving to Arsenal in 2017.
"We cannot sustain the numbers we have in certain positions," Arteta had said earlier on Thursday.
"There are some players that are going to go on loan and going to leave."
He added: "That is the priority. Then we will see if we have the right opportunity in the positions where we need some more help.