Manchester United manager Erik ten Hag hailed the performance of Lisandro Martinez, who he believes will form an impressive partnership with Raphael Varane.
The Argentine made his debut for the club during the final pre-season match, a 1-1 draw against Rayo Vallecano at Old Trafford, and caught the eye alongside the World Cup winner.
Martinez is a player Ten Hag knows well following their time together at Ajax, and United's boss hinted that the centre-back could establish himself as Varane's partner for the season ahead, which could cast further doubt on Harry Maguire's status as a first-team regular.
"It was a really good combination with Rapha. They played solid that's good to see. He integrated quite well into the team," he told MUTV.
United goalkeeper Tom Heaton was equally impressed by the performance of his new team-mate.
"That's been the case all week, I really enjoyed playing with him today. I think he'll be top, top player for the club," Heaton told MUTV.
"I thought he was outstanding today and I'm sure everyone is looking forward to watching him play this year.
"I think [his height] has been talked about a little unfairly. What he brings, his physicality, how he uses his body, his leap, what he gives you in terms of manoeuvrability and all the ball and personality wise, I think he will add an awful lot to the team.
"Even this week, you can see already what he brings. He brings that larger than life personality, I think he was excellent today and I look forward to hopefully playing with him more this year."
Manchester United begin their Premier League campaign against Brighton and Hove Albion on August 7, then tackle Brentford before a huge clash against Liverpool later next month.