EDEN PRAIRIE, Minn. - Maybe it's the four Super Bowl losses (with no wins), or the near-misses (1998, 2009) that leave Vikings fans a tad pessimistic, always waiting for the other shoe to drop.

Whatever the case, published reports that quarterback Sam Bradford is experiencing soreness in his twice-surgically repaired left knee will not be well-received by the purple faithful. ESPN insider Chris Mortensen says Bradford had an MRI on his balky knee earlier this week after experiencing swelling and pain in the wake of Monday night's win over the Saints.

Mortensen says the results were negative for serious structural damage, but there was enough concern over the joint to limit Bradford's participation in practice Wednesday and Thursday.

When asked if he was concerned about Bradford's health and his status for Sunday's game in Pittsburgh against the Steelers, Vikings Head Coach Mike Zimmer was terse in his response. "I'm concerned about all of our players. "

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"You anticipate Bradford will start on Sunday?" a reporter asked.

"I don't know, we'll have to see," Zimmer responded, then quickly added "I antcipate he will, yes."

When asked if he could confirm the report that Bradford had an MRI, Zimmer seemed exasperated. "I'm not going to talk about who had MRIs, who didn't have MRIs, Lots of guys have MRIs. I had one."

Officially, the Vikings are listing both Bradford and linebacker Anthony Barr as questionable for Sunday.