Celtic defender completes transfer deadline day move to St Johnstone
The reigning Ladbrokes Premiership champions have signed both Hatem Abd Elhamed and Moritz Bauer to play right-back this summer.
Tommy Wright has moved to add the Scotland youth international after a training ground bust-up with Richard Foster saw the veteran defender leave McDiarmid Park for a return to Ross County.
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Hide AdThis represents Ralston's third loan spell since graduating from Celtic's youth academy having also spent time with Queen's Park and Dundee United.
His contract with Neil Lennon's side runs until 2022.