Stoke City goalkeeper Thomas Sorensen believes Arsenal lack 'that bit of spine' to challenge for the title.
Arsenal's hopes of winning the Premier League suffered a fresh setback on Saturday after a 2-1 defeat at promoted Stoke.
The Gunners were undone by Rory Delap's long throw-ins and Sorensen dismissed their prospects of overhauling current leaders Chelsea.
"I think with the way the other teams are playing, it's going to be really hard for them," said Sorensen in The Sun.
"They are a fantastic football side, but they are just lacking that bit of physicality.
"When Chelsea came here, they matched us in the challenges, but Arsenal weren't quite there. That's the difference. They lack that bit of spine you need.
"They want to play all the time and sometimes you have to work hard and earn that opportunity to play your football.
"I've played against Arsenal a lot of times and I expected much more of them.
"They have their excellent players, like Cesc Fabregas. But they didn't find the fifth gear they normally do.
"Once we got the second goal it felt like WE were cruising. They totally lost belief. I think they expected a bit of an easier ride and no one's going to get that here."
Arsenal also had Robin van Persie sent off for barging into Sorensen and the Danish keeper admits he played a role in the Dutchman's dismissal.
He added: "I was teasing Robin. You could see in his eyes the frustration. I used that."