TOMAS Rosiky has tipped Arsenal team-mate Theo Walcott to make a big impact at the Emirates this season.

The Czech international, who is currently sidelined with a knee injury, believes the former Southampton forward is now a key figure in the Gunners squad.

He said: “Walcott is terribly unpredictable with his speed. Occasionally he lacks a little calmness but people always forget he’s only 19.

“When he plays well, they say he’s like Maradona. Then he has two bad games and they write he’s not improving at all and that he is stagnating. The truth is somewhere in between.”