First-team coach moves on after six years at Parkhead Celtic have bid farewell to first-team coach Gavin Strachan following confirmation of his move to West Bromwich Albion. The departure of Strachan, the son of former Celtic and Scotland boss Gordon, brings an end to his six-year spell at Parkhead serving under multiple managers including Neil Lennon, Ange Postecoglou, Brendan Rodgers and Martin O'Neill.