07/11/2013 11:16 EDT | Updated 09/10/2013 05:12 EDT

Rooney suffers hamstring injury ahead of Man United's friendly in Thailand, flies back home

BANGKOK - Manchester United striker Wayne Rooney faces up to a month on the sidelines after sustaining a hamstring injury in training for the friendly against a Thailand All Stars team in Bangkok.

Rooney flew back to England just after midnight on Friday, having been in Thailand less than 24 hours.

United were already without fellow striker Robin van Persie, who is on an extended break but will join the team in Australia for the next leg of their preseason tour.

The English Premier League winners will take on the Thailand All Stars on Saturday evening at the Rajamangala National Stadium without several players including the ailing Chris Smalling, Ashley Young and Shinji Kagawa who will only appear in the last Asian stop in Japan.