With Matt Cassel and Teddy Bridgewater still competing for the starting quarterback spot, Christian Ponder — the Vikings’ former QB of the future turned first-string clipboard-holder — didn’t even get a brief cameo in Saturday night’s 30-28 preseason victory over Arizona.

But that doesn’t mean the Vikings don’t see value in carrying three quarterbacks, one of whom would likely be Ponder.

“I don’t think there will be just two quarterbacks,” coach Mike Zimmer said Tuesday.

While Ponder has been used sparingly in team drills since the start of training camp, some days not even throwing a single pass, he continues to learn the offense and prepare in case his number gets called.

And even with Cassel playing well and Bridgewater displaying poise as a rookie, all it takes is a couple of injuries for the third-string quarterback to play an important role.

Just ask offensive coordinator Norv Turner.

Last year, when he was calling the plays in Cleveland, the Browns had three quarterbacks start at least three games because of injuries. Jason Campbell ended up starting half of them after injuries to Brandon Weeden and Brian Hoyer.

That’s why Turner hasn’t written off Ponder, who was booed at TCF Bank Stadium during an appearance in the preseason opener, and believes he could be an asset this season.