Defender Mustoe will spend a month at the Globe Arena having been drafted in by Shrimps boss Jim Bentley as cover for former Bradford full-back Robbie Threlfall, who has a muscle injury.
The 21-year-old enjoyed a spell in League Two last season with Barnet where he made 19 appearances in all competitions.
Meanwhile, Morecambe have added Under-18 player Will Bell to their first-team squad.
Bell has agreed non-contract terms and was an unused substitute during Saturday's goalless draw at home to Burton.







