The Spanish left-back, who will sign a season-long loan deal with a break clause in January, is set to become United’s second signing of deadline day after Turkish goalkeeper Altay Bayindir, who joined from Fenerbahce for £4.3m.
The 26-year-old, who has also played for Real Madrid and Atletico Madrid, trained with United on Friday and Ten Hag indicated he will be available this weekend.
“He is here, yes,” he said. “He is very experienced player, he has played for big clubs and played a lot of games in La Liga and the Premier League so has a very good background. So he can play very intense football so we are happy. We had a problem with Luke Shaw injured and Tyrell Malacia injured so we covered very well in an emergency situation.”
He added: “He will be in the squad as well so happy with the keeper group, we covered every position so I think we have a very good keeper group with the signing of Altay. We followed him very intensely and we think he has the skills to fit in at Manchester United and fit in at English football so we are glad we signed him. We are confident he will make a lot of progress.”
Bayindir could be required if Onana, who has been recalled to the Cameroon squad, plays in the African Cup of Nations in January. Ten Hag added: “I know everything about it, of course we spoke about it. We are in good contact with Andre.”
Rasmus Hojlund will be fit to make his United debut at the Emirates Stadium, with Ten Hag saying: “I think he is ready to start.”