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Vikings defensive end Everson Griffen was a surprise scratch last Sunday after becoming ill at some point between the release of Friday’s injury report and the deadline to submit a list of inactive players.

The league is looking into the Vikings’ failure to disclose the change in Griffen’s health as required by league rules. The Vikings haven’t shed any light into what’s bothering Griffen, who missed practice on Wednesday while undergoing further evaluation that coach Mike Zimmer believes will end with a clean bill of health.

“He’s finishing up some tests today,” Zimmer said, via the Minneapolis Star Tribune. “We’re anticipating that he’ll finish good.”

Assuming all goes well, Griffen is expected back on the field Thursday and in the lineup on Sunday when the Vikings bid for their fourth win of the season.

Cornerback Josh Robinson did practice on Wednesday, marking the first time he’s been on the field with his teammates since going on the PUP list at the start of camp. Robinson had a torn pectoral and can practice for the next three weeks before the team will be required to either add him to the 53-man roster or shut him down for the rest of the season.