And the stand-off now finds himself with the chance to put his mark on the starting spot for Wales, as one of six potential number tens in the 47-man training squad.
"It will be very difficult to choose, but from Dan's perspective he is probably way out in front at the moment," Jenkins told Wales Online.
"He has been exceptional for us over the last year and with the Ospreys as well. He is going to be pretty hard to dislodge. The battle is for the rest of the guys.
"We have some extremely talented players in that position for the one or two spots or whatever it's going to be."
Biggar's challenge will come from fellow GUINNESS PRO12 fly-halves Gareth Anscombe, Rhys Patchell and Matthew Morgan, as well as Rhys Priestland and James Hook.
However, having started all five of Wales' internationals so far this year, Biggar will be favourite to add to his 33 caps for his country when the World Cup comes around.
Wales will face Ireland on Saturday in the first of two warm-up fixtures between the two sides, before they take on Italy in their final game before a World Cup opener against Uruguay on September 20.
"It's up to whoever gets the nod this Saturday and in the games before the World Cup to give themselves a chance and stake a claim," Jenkins added.
"We have some talented players in this position and it will be tough to pick between them."
"We have some talented players in this position and it will be tough to pick between them."
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