Holgorsen said Cook is out this week and wouldn't play if the game were Saturday, and that he and similarly busy safety Karl Joseph needs time off, too.
"Both of those kids play hard," Holgorsen said. "They play with a lot of effort and they leave it all on the field. Darwin's groin got him. We're a little beat up and then he goes out in the (second) quarter and we didn't have him for the whole game.
Cornerback Daryl Worley aggravated a shin injury that cost him a game earlier this season and was replaced by Travis Bell. He'd been a starter this season before Worley took his spot. Cook was harder to replace, but Holgorsen was pleased by the result.
"Depth is obviously not where we want to be," he said. "We need snaps. We need depth. When guys play 92 snaps a game at the level that Karl plays at, it's going to catch up to them. It's going to catch up to Darwin, and it did.
"When you lose him and put (redshirt) Jarrod Harper in there, it's a different level. But Jarrod went in there and got good, quality snaps. He played at a high level. He played well, and he's going to be a good player for us. You have to take advantage of that."
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WVU WILL BE OUT on the road recruiting Thursday, Friday and Saturday as part of the evaluation period. Coaches will be watching games, obtaining high school transcripts and talking to players.
The Mountaineers only have 12 seniors on scholarship and already have 15 players committed to the 2014 class. That's because WVU has room to work with and can finally reach the limit of 85 scholarships. Holgorsen couldn't get close with his first three recruiting classes.
"The first one was three-quarters done before I got here, and done in the Big East," he said. "The second one was half selling the Big East and the second half we could start talking about the Big 12 for the first time. Last year was 100 percent talking about the Big 12.
"And this year, if we meet our quota of 25, then we're over our scholarship limit. That is the first time that's ever happened."
Holgorsen acknowledged he'll likely lose players currently on the roster, which means he can over-sign during this class and use the extra players to fill expected openings.
"You don't want to lose guys but the fact of the matter is that if guys don't go to class, or if they fail out or if they don't do the right things socially and get kicked out, that happens when you're dealing with 100 kids," he said. "More than likely we're going to lose a couple for a variety of reasons. But I'm comfortable with us being able to go out and get to 25 because we're three-quarters of the way there right now."