The 33-year-old full-back, who was capped once by Scotland, has agreed a two-year deal with the Parkhead club to link up with manager Gordon Strachan for a third time. He previously played under Strachan at Coventry City FC and Southampton.
Celtic travel to Slovakian side FC Artmedia Bratislava next Wednesday in the first leg of their UEFA Champions League second qualifying round tie.
©UEFA.com 1998-2017. All rights reserved.