<text>  Glasgow winger Sean Lamont has been ruled out of Scotlands remaining RBS 6 Nations games with a knee injury. Lamont suffered the injury during Glasgows 26-5 win over Zebre in the Guinness Pro12 on Friday night. He has been replaced in the squad by fellow Glasgow winger Sean Maitland, who missed Scotlands opening three defeats in the tournament with a shoulder problem. Scotland winger Sean Lamont centre has been ruled out for the remainder of the Six Nations campaign . Lamont will be replaced by Glasgow team-mate Sean Maitland left for the rest of the tournament . Edinburgh forward Stuart McInally also comes into the squad ahead of the Calcutta Cup match against England at Twickenham on Saturday as cover for hooker Ross Ford, who is fighting to overcome the back spasm he suffered against Italy. The 24-year-old has scored three tries in seven appearances for Edinburgh this season and started at hooker during their weekend win over Treviso after being converted from a number eight. Glasgow back Peter Horne is also being monitored by the Scotland medical team after suffering concussion against Zebre. Stuart McInally right has been included in Scotlands squad as cover for hooker Ross Ford . Scotlands medical team are monitoring the fitness of Glasgow back Peter Horne left 