Mikel Arteta says he is 'positive' the club can keep Pierre-Emerick Aubameyang.
The Gabon international scored a double in Wednesday's 4-0 win over Norwich City, taking his tally for the club to 63 in 100 appearances.
And Arteta is confident Aubameyang will sign an extension on his current deal, which expires in 2021.
"I don't know, I leave that to the football club and the people that look after those types of contract. Auba knows really well what my thoughts are towards him and the project that I want to create, and how much he's part of that. After that, it's not in my hands.
"I don't know, I am positive that we can keep him here for many years but things have to progress."
Asked how many more goals Aubameyang can score, Arteta added: "Hopefully at least another 100 but I don't know, I'm not a magician.
"What he's achieved today, to be the (fastest) to score 50 (in the Premier League) in the history of this football club, tells you everything about his mentality and the way he works every day on his finishing, on trying to help the team.
"He's decided to be better and better every day. So hopefully we can keep him here for a longer period."
