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Crisis-hit Arsenal manager Arsene Wenger’s troubles are mounting, with fears Alex Oxlade-Chamberlain faces SIX months on the sidelines.

Sunday tests confirmed damage to the left knee of the 20-year-old England midfielder, who went off injured in the Gunners' shock season-opening home loss to Aston Villa.

He will have a further scan on Monday, when his worst fears could be confirmed.

It leaves Arsenal desperately short of players ahead of their Champions League qualifier at Fenerbahce on Wednesday.

Bacary Sagna is also almost certainly out, while Aaron Ramsey and Tomas Rocisky are doubts.

Thomas Vermaelen, Mikel Arteta and Nacho Monreal are already missing from the trip to Istanbul for the first leg of a tie to decide who will advance to the Champions League's group stage.

Wenger, subjected to touchline abuse from his own fans during the Villa match, said: “He (Oxlade-Chamberlain) is definitely out. A knee problem. We don’t know how deep the problem is, but it’s a bad injury.”

It heightens the pressure on Wenger to respond to the fed-up fans by spending big to strengthen his squad.

There is a deal in place for Swansea and Wales centre-back Ashley Williams.

It just needs Wenger's say-so to get it over the line.

Arsenal are still in the market for a big-name striker.

They refuse to give up on Liverpool star Luis Suarez, but have now switched focus towards Manchester United’s Wayne Rooney.

Swansea’s Spanish forward Michu is the back-up option.

Wenger, whose only signing this summer was youngster Yaya Sanogo on a free, is under increasing pressure from the Arsenal board to spend.

There is £70m-plus available and the supporters made it clear that they want big signings.

Frustrated fans chanted “spend some f***ing money” during Saturday’s defeat, and it is understood comments aimed towards Wenger also became particularly nasty and personal.

Supporters shouted foul-mouthed abuse, branded the Frenchman selfish and vented their anger so loudly the Arsenal manager could not have failed to have heard it.

Arsenal were booed at half-time and at the end of Villa's 3-1 win, but it was the personal abuse that shocked regular observers of the club.

The situation is unlikely to improve until Wenger dips into the transfer market.

Gunners supporters have reacted angrily in the wake of the Villa defeat, questioning whether the manager should get a new contract.

Wenger is in the final season of his £7.5m-a-year agreement and there have already been preliminary talks about a new deal, although those have now been put on the back burner until after the transfer window closes on September 2.

Glyn Taylor, chairman of the Arsenal Supporters’ Trust, said: “In recent weeks Ivan Gazidis has spoken of the club’s intent to offer Arsene Wenger a new contract.

“The AST believes this is inappropriate.

“For now, the club’s entire focus must be on using the remaining days of the transfer window to strengthen the team significantly.

“A decision on whether to offer an extension to the manager’s contract which ends in May 2014 should only be taken following the closing of the transfer window and assessment of the team’s performances in the weeks ahead.

“Considerable improvement must be shown for us to be convinced this should happen, and we believe that other senior football appointments must come first.”