Gary Rowett has been appointed manager at The Den and he has brought in former Saint Callum Davidson as his assistant.
He links up with Rowett in London after a spell as coach at Dunfermline last season.
Davidson gets to work with Rowett again at Millwall
Davidson started his football career at St Johnstone, featuring for them on 43 occasions during the 90s. His impressive form was enough to earn interest from Blackburn Rovers.
He made the switch to Ewood Park in 1998 and had further spells at Leicester City and Preston, with Davidson becoming captain at the latter.
The 43-year-old returned to Perth to finish his career, formally hanging up his boots in 2014. He had served as the McDiarmid Park assistant during Scottish Cup winning 2013/14 season.
Rowett snapped him up as a first-team coach in June 2018 as the pair worked together at Stoke City. They both left the club the following January and Davidson found himself at East End Park until the end of last season.
Now Davidson has been reunited with Rowett for their London challenge, with the Lions currently 16th in the Championship.
St Johnstone fans will no doubt be happy for their former player and assistant manager.