Celtic's development coach Stevie Frail leaves the club as he seeks "new challenges in football".
Leyton Orient goalkeeper Garry Woods joins Ross County on loan until January.
Teenage midfielder Greg Hurst joins St Johnstone despite having only made two substitute appearances for Stirling Albion.
Celtic sign midfielder Ryan Christie on a four-year contract and send him back to Inverness on loan.
Celtic have completed the signing of Croatian defender Jozo Simunovic from Dinamo Zagreb on a five-year contract.
Motherwell have signed Manchester United U21 captain Liam Grimshaw on loan until January.
Celtic have signed 21-year-old Croatian centre-back Jozo Simunovic from Dinamo Zagreb.
Scotland Under-19 striker Gary Oliver joins Queen of the South from Hearts for an undisclosed fee.