DOCKERS captain Matthew Pavlich remains likely to run out in the purple-and-white on Saturday despite being sidelined from Fremantle's Round 22 win with a quad problem.

There is some concern though for Pavlich's tight quad, however, and he'll be assessed this week to determine his fitness to play Port Adelaide at Patersons Stadium on Saturday.

Pavlich commenced the warm-up with the Dockers before their 58-point win over Brisbane on Sunday, but was forced to withdraw from the match before the first bounce.

The Dockers will be without Nat Fyfe through suspension, and likely Michael Barlow and Luke McPharlin with injury on Saturday, so Pavlich remains of vital importance for the top-four qualifying clash.

"They [Fremantle's medical team] will have to do an investigation [on Pavlich's quad]," Dockers coach Ross Lyon said on Sunday.

"He just tightened up in the quad. 

"Hopefully they'll do some investigations and more stuff will come to light." 

The Dockers also substituted Lee Spurr from Sunday's match against the Lions due to quad tightness.

Port Adelaide could go into Saturday's season-defining clash with Fremantle unchanged after Justin Westhoff and Jay Schulz were cleared of injury.