EDEN PRAIRIE, Minn. (AP) — Minnesota Vikings left guard Brandon Fusco is questionable for the game against San Diego on Sunday.

Fusco missed practice Wednesday and returned on a limited basis Thursday after going through the league’s concussion protocol. He participated fully in practice Friday. Coach Mike Zimmer says a decision on his availability against the Chargers should be made well before the game Sunday.

READ MORE: Wisconsin Audit Finds Elections Are 'Safe And Secure'

The Vikings can ill afford another injury on an already banged-up offensive line. Starting center John Sullivan is out for at least two months after having back surgery, and right tackle Phil Loadholt was lost for the year in the preseason with a ruptured Achilles tendon.

READ MORE: University of Minnesota Will Require Proof Of Vaccination For Employees

Defensive tackle Shamar Stephen is the only other Vikings player listed on the injury report. He is probable with a knee injury.

MORE NEWS: Buffalo Man Charged With Sexually Assaulting 18-Month-Old

(© Copyright 2015 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)