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Several stadiums have playing surfaces that create periodic concerns for the NFL. And, of course, one of them already is hosting a college football game one day before the local pro team plays there.

Via Doug Padilla of ESPNChicago.com, the Bears host the Vikings at Soldier Field on Sunday at noon local time, 19 hours after a college game between Washington and Illinois there kicks off there.

And rain is in the forecast for Sunday.

“I’m not concerned about it,” coach Marc Trestman said, via Padilla. “We don’t have any control over the weather. We played in some mud at training camp, certainly, and had weather in training camp, so our guys have been on that kind of field.”

Regardless of whether it’s sloppy on Sunday, ripping up the turf in Week Two doesn’t bode well for a sound playing surface in November and December.

While it makes sense to use football venues that host only 10 NFL games per year (and maybe two more) as much as possible, playing more games on the surface makes it even more important to ensure that the playing surface is in good shape.

At Soldier Field, it too often isn’t.