Walker will be out for the rest of the season with a knee injury (Getty)

Director of rugby Pete Drewett said: "It is still unclear exactly how long Tony will be out of action for as he is still undergoing tests on the injury.

"But we do know that he will not return to the field this season."

The 32-year-old, who has played for Scotland A, was the captain of the second string side which lost 29-28.