GREATER Western Sydney draftee Aiden Bonar has suffered an early setback in his time at the club after straining his hamstring.

AFL.com.au understands the exciting prospect, who the Giants took with pick 11 at last month's NAB AFL Draft, is expected to miss three-to-four weeks of training with the injury.

The club's head of athletic performance David Joyce confirmed Bonar's injury.

"It’s unfortunate for Aiden to have a minor setback early in the pre-season," Joyce said.

"There's a range of conditioning training he’ll keep doing in the rehab group before re-joining the main group in the coming weeks.

The 18-year-old was one of the bolters in this year's draft crop, having undergone two knee reconstructions before returning to play for the Dandenong Stingrays at TAC Cup level.

The 191cm Bonar is likely to start his career as a half-forward, but he also could move into the midfield in time. His athleticism and power appealed to the Giants, who believe he offers their list a point of difference and some X-factor.

After the draft, Giants recruiting manager Adrian Caruso told AFL.com.au the Giants had eyed Bonar from the moment they secured pick 11 from Essendon as part of the Devon Smith trade.