Brown out for up to six weeks
Celtic skipper Scott Brown had surgery on an abductor problem during the international break and will be out for four to six weeks.
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Ahead of Sunday's Clydesdale Bank Premier League clash with St Mirren in Paisley, Hoops boss Neil Lennon gave an injury update at the club's Lennoxtown training complex.
He said: "Scott Brown had surgery in the break and so he is looking at a month, four to six weeks.
"Thomas Rogne has a hamstring strain and he will out for two to three weeks.
"James Forrest (back) is continuing his rehab at the minute.
"Joe Ledley didn't train today, due to a slight groin strain but will hopefully train tomorrow and Adam Matthews (hamstring) will train on Monday.
"Charlie Mulgrew is fine, he had a tight hamstring before the Serbia game and Gordon Strachan didn't take any chances with him obviously, but he came through training today okay."