Purrington suffered a toe injury which kept him out at the start of this season, but returned to fitness in September.
The arrival of Derek Adams, who replaced Mackay in charge in November, saw Purrington reunite with his former Plymouth Argyle boss.
Although he has started all seven Premiership matches Adams has taken charge of so far, netting in a 3-0 win over Motherwell, Purrington has been allowed to return south of the border.
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Ben Purrington leaves Ross County to join Exeter City
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