The remainder of the Iceland international's season, together with his participation at this summer's World Cup, were thrown into doubt last month when he damaged the joint in his right knee but he appears to be on target to be fit for his country's trip to Russia.
He might not play any part in Everton's increasingly meaningless run-in, however, which,. if true, will likely go down well in Reykjavik where the Icelandic FA is no doubt drawing up plans for their first World Cup Finals.
"It'll be touch and go whether he'll get a game before the end of the season," Allardyce said of Sigurdsson during his press conference today after expressing a degree of frustration at the number of longer-term injuries that have affected his squad this season.
The manager is still without James McCarthy, who suffered a broken leg against West Bromwich Albion in January, Eliaquim Mangala, who is now back in the gym strengthening his knee following surgery in February, and Mason Holgate who also required an operation on his ankle.
"Obviously all these players can be missed at certain stages of the season but you wouldn't expect them to be out as long as they've been out.
"Losing players at the back half of this season is not something you would want to have to deal with but we have to and we're dealing with it very well at the moment.
Allardyce explained that Idrissa Gueye, who only started last week's Merseyside derby on the bench, is fit to play, as is Phil Jagielka who suffered what the manager described as "a reaction" but trained as normal yesterday.