Western Bulldogs forward Jake Stringer has been ruled out of his side's clash with Port Adelaide in Ballarat after sustaining a hamstring injury.

Stringer suffered the injury inside the opening minutes, and immediately went down into the rooms following the incident.

It's his second hamstring injury this season, after he missed three games following a hamstring injury he suffered against Carlton in round 17.

Stringer tried to run off the injury, but was unable to shake off the pain and had his hamstring iced late in the first term.