Keown told BT Sport: “Arsenal just haven't got that cutting edge and they're losing ground on their rivals, they're slipping deeper and deeper.
“The Champions League now is looking like it's not going to happen for Arsene Wenger.
“The questions will come again for the manager, is he going to be there next season or not?
“It looks like the end, we've talked about whether it's the end of this chapter for Arsene Wenger, but (Mesut) Ozil and (Alexis) Sanchez, Sanchez just didn't give enough tonight.
“If it doesn't get much better for him (Wenger), then at the end of the season he has to hold his hands up and say well 'maybe I'm not the man to take this club forward'."