EXCLUSIVE | By Arsenal correspondent Tony Hughes

Joel Campbell is set for an Arsenal promotion after injured ruled Danny Welbeck out for up to six months, Football Insider sources understand.

Arsene Wenger is prepared to use Campbell as striker back-up even though he has never scored in 10 appearances during his four years at the club.

Wenger has been forced to consider attacking alternatives after Arsenal announced on Thursday that Welbeck has undergone knee surgery. Football Insider understands the England international will not play again for four to six months.

Welbeck’s lengthy absence leaves Arsenal with only one orthodox spearhead in Olivier Giroud. Theo Walcott has led the line from the start in three matches this year but he has only played a handful of games at centre-forward during his decade at Emirates Stadium.

Campbell, who was an unused substitute as Arsenal defeated Newcastle 1-0 last Saturday, is also not a line-leader in the traditional mould.

He was principally used on the right flank during his loan at Villarreal last season, which followed temporary spells at Olympiakos, Lorient and Real Betis.

Arsenal were in talks sell the Costa Rica international to Palermo during the summer  but the two clubs were unable to agree a deal. As revealed by Football Insider, Arsenal wanted £4million for Campbell and were reluctant to sanction another loan move.

Campbell has one year remaining on his Arsenal contract and the end of the transfer window mean Arsenal have lost their last opportunity to get a significant fee for him.

Up until January at least, the Costa Rican will be used as back-up to Giroud and Walcott .

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