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And Caig told the Daily Express: "I looked at the possibility of playing as an amateur, but it seems to be a no-go. The SFA are willing to register me, but the SPL have told me I wouldn't be able to play first-team games."
Caig, whose contract with Vancouver ended after the European transfer window closed, must now wait until signings are allowed again in January before joining Gretna.
"I haven't been paid for three months and now I won't be able to earn a living until 1 January, despite the fact that I have a family to look after and bills to pay," he said.
Gretna earlier this month plugged the gap by bringing 37-year-old Colin Scott out of retirement as back-up to Greg Fleming. Scott, who signed until January, had ended a seven-year spell with Queen of the South in the summer after being advised to give up the game following a troublesome knee injury.
Caig played for the Blues from 1992 to 1998, where he made 244 appearances, the highlight of his time at Brunton Park being the penalty saves in the LDV Vans Trophy at Wembley against Colchester in 1997. However, the following year he was controversially allowed to leave by club owner Michael Knighton for a £5,000 fee just before the mid-season transfer deadline. The move eventually leading to the infamous loan signing of Jimmy Glass.