Celtic winger Paul McMullan joins St Mirren on loan for new season as part of a ground rental deal between the clubs.
Midfielder Stuart Carswell has joined St Mirren on a one-year deal after leaving Motherwell.
Rangers will face Scottish Championship rivals Hibernian in the first round of the Petrofac Training Cup.
Steven Thompson has extended his stay at St Mirren after signing a new one-year contract with the Paisley club.
Ian Murray has appointed Mark Spalding, who was his deputy at Dumbarton, to the role of assistant manager at St Mirren.
Alan Gow admits it will be difficult for St Mirren to achieve immediate promotion back to the Scottish Premiership.
Midfielder Alan Gow will stay at St Mirren until the end of the 2015/16 season after signing a new deal with the club.
St Mirren midfielder John McGinn has instigated legal action over a training ground prank, according to the club's chairman.
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