Spurs' once formidable 10-point lead has been whittled down to four, and the Gunners' are looking up - their confidence lifted by the 3-0 win over AC Milan.
Vermaelen said: "You can see that we fought really hard. You can see we have a lot of qualities if we put the effort in. You can see what we are capable of because Milan are top in Serie A. That's not bad.
"We have got good results against Tottenham and Liverpool - and if we play like we did against Milan, I am not worried because we will be top four. We can beat any team. There are a few contenders - Newcastle, Liverpool, Chelsea. We will have to fight toe-to-toe for fourth, and maybe third. You never know."