Shane Watson has headed home for further assessment on an abdominal strain in the latest injury blow to Australia's Twenty20 World Cup plans.

Watson has been ruled out of the rest of the Pakistan Super League after hurting himself while bowling for Islamabad United.

Fitness race: Shane Watson celebrates the wicket of India's Shikhar Dhawan during their T20 International in Sydney last month. Credit:AP

The 34-year-old posted a video on the club's Twitter account, confirming he would miss the rest of the T20 tournament in the United Arab Emirates.

"I've unfortunately made this video because I injured myself last night bowling, so disappointingly I'm going to have to head home," Watson said.