The former-Arsenal star, Paul Merson, named Thomas Partey as the “number one” signing of any Premier League club in the summer.
Partey joined the Gunners from Atlético Madrid after they activated a €45 million release clause.
The Ghanaian has impressed on his debut – a 2-1 Europa League win over Rapid Vienna and created an excellent field show as they defeated Manchester United in their second Premier League start.
Although Merson refused to be swept away by the victory at Old Trafford, he praised Partey for his “huge” display.
“They beat a terribly, terribly poor Manchester United team on the day. They’ve done a job, we’ve seen them lose those games over the last five or six years.
“But I think Partey’s a massive, massive difference. I mean, what a signing.
“When you talk about signings in the summer, he’s got to be number one. I cannot believe, without being horrible here, that Arsenal got him,” Merson said on Sky Sports.