Eurosport - Thu, 28 Jan 16:27:00 2010
The 24-year-old, who has made a huge impact at the Emirates after his move from Ajax last year, limped off after 35 minutes.
But the Belgium international still may miss Arsenal's Premier League clash with Manchester United on Sunday.
"There is no fracture in Thomas' leg but his injury still has to be assessed. There is still a good chance he will not play on Sunday," Arsenal manager Arsene Wenger said.
Vermaelen scored on his league debut for Arsenal in the season-opening 6-1 win at Everton and has netted six goals in 31 appearances for the club.
Eduardo will also miss Sunday's match after picking up a hamstring injury at Villa Park but could be back next weekend for the trip to Chelsea.
But Wenger has added Emmanuel Eboue and Alex Song to his squad after they returned from the African Cup of Nations.