He suffered a shoulder injury during Warriors’ 22-9 win over Munster at Firhill on Friday and has been told to expect a lengthy lay-off.

It is a major setback for arguably one of the best young players in the country - ruining Jackson’s hopes of making his Scotland debut in November's autumn internationals.

Jackson, who sustained the injury while scoring the only try of the night, will also be out of contention for Glasgow’s opening two Heineken Cup pool matches in October.

Glasgow team doctor Gerry Haggerty said: “Following medical examination on Monday evening, Ruaridh will have his shoulder stabilised in the coming week once the injury has had time to settle.

“It will take around three months for the shoulder to heal. But our immediate aim is to ensure a full recovery for Ruaridh and to have him back playing for Glasgow as soon as possible.”