Arsenal manager Arsene Wenger has expressed his disappointment after his side suffered a new blow in their hopes to win the Premier League with a "very unlucky" home defeat to Swansea on 2 March. The French boss, furthermore, revealed that goalkeeper Petr Cech played the game with a groin problem which will keep him on the side-lines alongside Lauren Koscielny for the crucial North London derby at Tottenham on Saturday.

Joel Campbell put the Gunners ahead earlier in the first-half but Swansea came from behind thanks to Wayne Routledge and Ashley William to win the game, leaving the Gunners third in the table, six points behind Leicester City and thee away from Spurs.

"It was a very unlucky defeat because we created many chances, we were unlucky in our finishing and they only had two shots on target which were both goals. It's a very disappointing result. The players are very down but we have to respond to that," Wenger explained in the press conference after the game.

"We focus on our job and come back reminding ourselves that we have some quality as well. Of course we have to analyse it as well and bounce back. We have a big game in three days," he said. "At the moment I am worrying about our results. We just lost three games and that is always a very disappointing moment for the team. At the moment we don't dream. We have to be realistic and come back to what we do well, the basics."

The French boss, furthermore, revealed that Arsenal will go to White Hart Lane without two of his most important players as both Cech and Koscielny will miss the derby.

Wenger explained that the keeper, who had a shaky performance against Swansea, was already struggling with a groin problem before the game. Wenger said: "He (Cech) struggled. He had a little groin problem before the game and I think he struggled a little bit tonight. He will not play on Saturday."

"I don't know, we have to see. It's a muscular problem, a calf problem and I don't know how long he will be out for."

Koscielny, meanwhile, already missed the game against the Wales side and Wenger confirmed that he will also remain on the side-lines for the derby. "He has a calf problem as well," the boss said. "He will not play on Saturday."