Alex Waller

Co-captain Waller suffered an Achilles injury during training in the week and will not play again during this campaign.

Biggar was forced off during the first half of the 27-21 defeat to Saracens at Franklin's Gardens on Sunday afternoon.

And after the game, Saints boss Boyd gave injury updates on the duo.

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Dan Biggar

On Waller, Boyd said: "He snapped his Achilles tendon in training on Thursday.

"It was very innocuous but unfortunately his season is finished.

"It's the vagaries of any sport, let alone a contact sport.

"I think he's been playing really well this year, and leading the team really well.

"One minute he's doing that, the next he's waiting to go for surgery."

On Biggar, Boyd said: "I don't think it is (a bad injury).

"He's hyperextended his leg in a collision and he seems to be moving relatively okay.