The Vikings' initial belief is that Smith suffered a high-ankle sprain during Sunday's 34-26 win over the Cardinals, Jeremy Fowler of ESPN.com reports.
Smith will undergo further testing including an MRI on Monday, but if a high-ankle sprain is confirmed, the tight end likely will be forced to miss time. Johnny Mundt and Jacob Hollister would stand to handle increased roles and hold down the tight end position if Smith indeed needs to sit out. Smith has logged three straight games with exactly four catches, which he translated into 28 receiving yards Sunday.