Rosicky was superb in victory at West Bromwich Albion.
The midfielder told arsenal.com: "During the last couple of games we have produced some good football," he said. "It gives you confidence when you win in Munich and at a place like West Brom when in the last 20 minutes your backs are against the wall.
"But if you are speaking about third or fourth place you have to win your home games. Our form there must improve."