The Ghanaian was signed from Atletico Madrid for £45.3million in the summer transfer window, but has only played a handful of games due to injury.
"We are in January and I think he's played two and a half games, that's all and he was our main signing." Arteta said of Partey during a press conference following Saturday's 4-0 win over West Brom
"We've been missing him. He brings something different to the team, he's a player with an enormous talent. But as well someone that can transform the team the way we want.
"It's great if we can have him, keep him healthy and I think he will contribute in a really positive way.
"He's done the most part training the last few days. He's feeling good and we will assess him.
"He needs another two or three good sessions to see if he's 100 per cent OK to play. And if that's the case, great news for us."