Roy Krishna will miss most of the rest of the A-League season.

The Wellington Phoenix are unlikely to look outside their current playing group as they digest a hammer blow for their A-League chances.

Striker and leading goalscorer Roy Krishna is expected to be out for three months with a foot injury.

That could well be the rest of the A-League season, given the Phoenix's final regular season match is on April 10, exactly three months from Sunday.

Krishna has been a leading light for the Phoenix this season, scoring six of their 17 goals and leading the attack. He was injured in a 3-1 loss to the Central Coast Mariners on December 31 and initially thought to be out for a month.

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But Phoenix coach Ernie Merrick told media that was likely to blow out to 10-12 weeks.

"Roy Krishna has got a really bad ankle injury. He could be out for three months. It looks like the ligament that connects the two bones in the lower leg, the tibia and fibula, has split and the ligament has torn," he said.

"That's a pretty bad injury."

With Jeffrey Sarpong's strain considered "minor" - he may well play against the Brisbane Roar in Wellington on Sunday night - and Blake Powell in the mix, as well as some youngsters, Merrick felt that "we have enough cover and a good enough squad", so at this stage there was nobody outside the current squad in their sights.

Despite the blow, and the fact the Phoenix are missing a host of first-choice players for the Brisbane match, Merrick still hasn't lost his sense of humour.

"We feel as though we could do with another striker so (assistant coach) Chris Greenacre will start training. He scores more goals at training than most players."