Partey, who joined Arsenal in a £45 million deal from Atletico Madrid on deadline day, delivered a brilliant display at Old Trafford as the Gunners sealed a 1-0 win over United.
Pierre-Emerick Aubameyang’s penalty in the second half secured victory for Mikel Arteta’s side, while Partey dominated the midfield battle against Paul Pogba and Bruno Fernandes.
And Keane was impressed with the Gunners’ latest signing.
‘Brilliant, I thought he was outstanding,’ Keane told Sky Sports when asked about Partey’s performance.
‘We said before the game, this guy’s no mug, he’s played for a big club, he’s played in big competitions.
‘We saw today, when you watch a player live that’s when you can judge a player.
‘The more I look at him the more I wish he was in Man United’s midfield.
‘He’s big, he’s strong, he’s aggressive and he likes to pass it forward. He can deal with the ball, he looks comfortable on the ball, just small little details, composure, good first touch, retaining possession, that’s the name of the game.’