The goalkeeper has been linked with an Anfield switch following a perceived drop in form by current No.1 Pepe Reina but the player himself has affirmed his happiness at the DW Stadium.
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Martinez believes that the rumours are a big compliment to his first-choice shot-stopper but stresses that the club have no need to sell anyone.
"We're in a good moment financially. We don't have to sell players and that's a real strength of ours," the Spaniard told reporters.
"It's a really nice compliment for Ali and he's been outstanding since coming to the football club.
"We have a few players who are reaching a very good level of form and I'm not against having a lot of good football compliments."
Wigan have sold a number of their key players in big-money moves over recent years, most notably Antonio Valencia to Manchester United in 2009-10 and Victor Moses to Chelsea this past summer for a reported combined total of £27 million.