A JAW injury is set to force fly-half Duncan Weir to miss Worcester Warriors’ trip to reigning Gallagher Premiership champions Saracens on Saturday (3pm).

There are also doubts over prop Nick Schonert (concussion) and wing Melani Nanai (shoulder) but flanker Marco Mama is back in contention after overcoming a dead leg.

Weir was struck in the side of the face by Motu Matu’u’s head in the first half of Warriors’ 20-6 victory over London Irish at Sixways.

The Exiles hooker was sent off for the high tackle by referee Ian Tempest and is expected to face a disciplinary hearing this week.

Director of rugby Alan Solomons said it was “highly unlikely” Weir would face Sarries with Jono Lance set to take his place.

“Duncan has got to see the dentist,” Solomons said.

“I think he had a plate in there anyway so he has broken his jaw before.

“He is not feeling too good and is highly unlikely he is going to be playing this weekend.

“Jono came on and did well (against Irish). He has played there before so he is an option.

“Shilly (Jamie Shillcock) is an option as well.”

Solomons said the only other injury blow from the Irish clash was to Schonert who failed a head injury assessment (HIA).

“Nick is not looking great either so we will see,” Solomons said.

“He had a HIA and a decision will be taken later on in the week.”

Nanai was ruled out of Warriors’ match against Irish with a shoulder issue sustained in the 36-3 thrashing by Gloucester two weeks ago.

But the marquee summer signing could be back in the selection mix for Worcester’s visit to Sarries.

“He has had an injection so we have got to wait to see how that goes,” Solomons said.

“He has got some old stuff in his shoulder so it is nothing major.

“But it is believed the injection will clear it up.

“We will see how he is tracking to see whether he is in contention for this week or next.”

Mama has not played for Warriors since suffering a dead leg in the defeat to Exeter Chiefs in early November The influential forward returned to action in Worcester Cavaliers’ 11-try trouncing of Wasps A two weeks ago and is now vying for a place in Warriors’ back row.

“He is coming along nicely,” Solomons said.

“He played in that Cavaliers game and the turnaround was a bit short for the next week.

“But he should be available for selection this week.”