It is believed that Saints were willing to offer £40,000 for the player, while Thistle wanted £100,000. There's still around 90 minutes left until the deadline so there is still an outside chance the deal could be resurrected.
Saints are also believed to be trying to bring Steven Smith to the club on a permanent basis. A loan deal for the Rangers player was agreed last week but fell through due to SPL rules. Bringing the leftback to the club permanently could happen.