Thielen (ankle) is undergoing an MRI on Monday, Ben Goessling of the Minneapolis Star Tribune reports.
Thielen will receive an MRI to determine the severity of his reported high-ankle sprain, an injury which forced him out of Sunday's divisional loss to the Lions. Considering the quick turnaround before Thursday's home matchup against the Steelers, Thielen appears to be looking unlikely for Week 14. For the time being, however, it remains unclear whether his injury will entail a multi-week absence.