Morecambe winger departs the club by mutual consent
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He made 23 appearances for the club, all of them under Robinson, with the last being Morecambe’s goalless draw at AFC Wimbledon in mid-January.
McDonald did not feature under Robinson’s successor, Derek Adams, upon his return to the club in February.
Instead, Adams named him as one of 10 under contract players who were transfer-listed at the end of last season.
McDonald is the third of those 10 to leave, following on from the exits of Jonah Ayunga and Connor Pye.