(Adds update on Bendtner injury) By Mike Collett LONDON, Jan 4 (Reuters) - Arsenal winger Theo Walcott angered Tottenham Hotspur fans while being carted off on a stretcher during his side's comfortable 2-0 win over their London rivals in the FA Cup on Saturday. Arsenal were already heading into the fourth round draw, with goals from Santi Cazorla and Tomas Rosicky, and the mood of the visiting suppporters was not helped by Walcott gesturing the scoreline with his fingers after injuring his knee. His actions could yet take some of the gloss off an impressive Gunners display if the FA take a dim view of his actions, although Arsenal manager Arsene Wenger played down the incident which saw a grinning Walcott showered with coins. "Of course, if we lose Theo for a longer period, it's a problem." However, he did have some positive news on Denmark striker Nicklas Bendtner, who was injured scoring Arsenal's first goal in Wednesday's 2-0 Premier League home win over Cardiff City. More...