Rosicky scored both Arsenal goals in last weekend's vital win at West Bromwich Albion, and Vermaelen - who was watching from the bench as Rosicky grabbed his brace - enjoyed the show.
Speaking to the official matchday programme, the Belgian defender said: "Tomas scored two good goals so we are all pleased for him.
Read more from Thomas in the Norwich City edition
"The first one was not easy, because it looked like a hard cross from Gervinho. It was a good move and ball from Gervinho to set it up and a great finish from Tomas. I didn't have a good view of his second one, but it looked like a nice volley."
The 32-year-old Czech schemer started only his second Premier League game of the campaign last Saturday, after a frustrating time with injuries, but he has hit a similar level of form to this time last year, when Rosicky proved instrumental in Arsenal's surge to a third-place finish.
"Tomas has always been a great player for us," Vermaelen added. "He has been unlucky with injuries this season but his technical qualities are amazing.
"He's a popular guy around the Club, he's been here for a long time, he knows everyone and we all get on with him because he is really relaxed. On the pitch he is reliable, always available to receive the ball and his technique is almost perfect."
Arsenal to win @ 1/4