The Gunners forward has been heaping praise on one of his team-mates.
Indeed, the forward feels Cech's leadership from the back and ability to talk to his defence has been a game changer for the north London side this term.
Walcott is quoted as saying by ITV: "From when we signed him, we all knew how good he was [after] what he achieved at Chelsea. On a personal level, for him it's great.
"He's changed us completely in that back four. He's a talker, he believes in us all.
"That's why he wanted to join us and having that presence behind you is always nice to have. He's very commanding, he's a leader in the dressing room as well, he always likes to talk."
You might think Walcott's comments don't have anything to do with Liverpool but they sum up the Anfield outfit's biggest problem right now.
Arsenal clearly outrank Liverpool in midfield and up front - but Jurgen Klopp's side have done well enough in front of goal for the most part.
The biggest deficiency Klopp has inherited from Brendan Rodgers (and not yet been able to improve) is in the defensive area. And that has mostly stemmed from errors - and a lack of leadership - from Mignolet.
Cech is everything Mignolet isn't, which is similar for a number of Arsenal's best players - Alexis Sanchez being a prime example.