Ten Hag confirms that Sergio Reguilón has already trained at Manchester United and is available to play against Arsenal on Sunday
United moved to bring in the left-back on loan following injuries to Luke Shaw and Tyrell Malacia.
Ten Hag said: 'He (Reguilon) is here, he trained. He's a very experienced player, played for big clubs, already played a lot of La Liga and Premier League games.
'He has a very good background, he can play very intense football, so we are happy. We had a problem with Luke Shaw injured and Tyrell Malacia injured, they are long-term out, so we responded well in that emergency situation.
'He will be in the squad as well, yeah, so happy. Now we have to keep the group, again it's fully there. We've covered every position and I think we have a very good 'keeper group arrival in Altay.'