Is Mike Zimmer that worried about Will Fuller?

The custom of an NFL head coach heaping praise upon that week’s opponent is as old as leather helmets.

Vikings coach Mike Zimmer engaged in such coachspeak this week when talking about Texans wide receiver Will Fuller.

“It’s nerve-racking, to say the least,” Zimmer said about the rookie’s 4.32-second 40-yard dash speed.

Fuller had a breakout game in Sunday’s 27-20 win over the Titans, catching seven passes for 81 yards and a touchdown and returning a punt 67 yards for a touchdown. His longest reception was a 28-yarder on a screen pass with all of the yards coming after the catch.

HOUSTON, TX - OCTOBER 2: Will Fuller #15 of the Houston Texans returns a punt for a 67 yard touchdown as Tennessee Titans defenders pursue in the third quarter during the NFL game between the Tennessee Titans and the Houston Texans at NRG Stadium on October 2, 2016 in Houston, Texas. (Photo by Bob Levey/Getty Images)

The Vikings defense will have its hands full with Fuller as the complement to DeAndre Hopkins, even if Hopkins is off to a slow start (17 catches) this year after catching 111 passes last year.

But nerve-racking? Zimmer has the Vikings off to a 4-0 start after losing Teddy Bridgewater a week before the start of the season and Adrian Peterson in Week 2.

With a defense that’s ranked in the top 10 overall as well as against the run and the pass, and with all the adversity his team has overcome this year, it’s hard to believe that anything is “nerve-racking” for Zimmer.