Promising Port Adelaide midfielder Hamish Hartlett's AFL preseason has again been derailed by a hamstring injury.

Hartlett, rated a potential star, was restricted to just four games last year by hamstring injuries which initially flared last preseason.

The 20-year-old strained his right hamstring at training on Monday, a club spokesman said.

Hartlett will have scans but is expected to miss the next three weeks of training.

The classy onballer has suffered a series of soft tissue leg injuries since being recruited with Port's number four pick in the 2008 national draft, managing just 15 games for the club.

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