Arsenal blew a 2-0 lead as the hosts struck twice inside the final ten minutes.
Saka said afterwards, "Yeah, it's very flat. Very disappointed with the result and especially with the way we played in the second half. Far from the standards we've set this season.
"It's time for us to reflect on the last few performances and fix the issues immediately, so we can get back to winning games, go on a run and build momentum because we've lost that a bit right now.
"I just think we have to get back to our level. Do the basics right and we've got more than enough quality in this team to win games, especially in the games where we've been dropping points in recently. We need to fix that and that's all our focus is right now."
The result has Arsenal sitting five points clear at the top of the Premier League table, though having played one game more than second-place Manchester City.