Rosicky replaced Mesut Ozil for the Gunners’ clash with Sunderland on Saturday, and proved a more than capable understudy, scoring a fantastic third goal in a comfortable 4-1 win.
The Czech playmaker has struggled with consistent injury problems since signing for the Gunners from Borussia Dortmund in 2006, and is yet to extend his current contract which expires at the end of the season.
But Wenger insists the 33-year-old remains firmly in his plans, and is confident a new deal will be agreed shortly.
“Tomas Rosicky will stay. We have an agreement with him and it will come out soon,” Wenger said.
“I am absolutely adamant he has to stay at the club.”
Wenger was impressed with Rosicky’s performance against Sunderland, which closed the gap on leaders Chelsea to just a single point following their late victory over Everton earlier in the day.
“He is maybe one of the players who plays the game of give and move, is a great accelerator of the game,” he added.
“When the ball comes to him it is ‘boof’. It is second gear now and that is something I admire in him.
“He makes always things happen, not with individual dribbling but with individual acceleration of his passing and of his runs.”