London, December 30 (Reuters): Arsenal defender Shkodran Mustafi has recovered from a hamstring injury for the London derby against Crystal Palace but winger Theo Walcott and left back Kieran Gibbs will miss Sunday's Premier League clash at the Emirates Stadium. Arsenal have missed Mustafi's calming influence in defence, losing two of their last three games since the 24-year-old German, who is yet to taste defeat since joining the Gunners in August, limped off in the win over Stoke City this month. "Shkodran is back in normal training and he will be back in the squad," manager Arsene Wenger told reporters on Friday. Gibbs injured his knee in his second league start of the season in Monday's win over West Bromwich Albion and Walcott remains sidelined with a calf problem. Wenger also provided a positive update on striker Danny Welbeck's return to fitness following a long-term injury. "Welbeck is fit and sharp. He is in training and he looks quite good," Wenger said. Palace last week parted company with manager Alan Pardew and Wenger believes Sunday's match will be more difficult now that former England boss Sam Allardyce is in charge. "The level of confidence and urgency goes up when a new manager comes in and that makes the games more difficult," Wenger said. Arsenal, who are fourth in the table and nine points behind leaders Chelsea after 18 games, will hope to continue their 22-year unbeaten home run against 17th-placed Palace on Sunday.
