The 30-year-old left the Scottish Premiership side in 2017 following a forgettable seven-month spell.
He now looks to move on and establish himself as a top-tier tactician in Portugal.
After a difficult stint in charge of Hearts, Scottish manager Ian Cathro is working to rebuild his reputation at Estoril.
The 30-year-old left the Scottish Premiership side in 2017 following a forgettable seven-month spell.
He now looks to move on and establish himself as a top-tier tactician in Portugal.