The Kansas City Chiefs’ secondary delivered some big hits against the Arizona Cardinals in the preseason opener, but the unit also absorbed two major injury concerns in the first half.

Not only did the Chiefs watch cornerback Jaylen Watson leave with a concussion early in the game, but safety Deon Bush was also carted off with a leg injury that was later revealed to be an Achilles. Both players were declared out for the rest of the game by the Chiefs.

Other Chiefs players who sought attention from trainers so far in the first preseason game were linebackers Jeffrey Bassa and Cam Jones.

The injury hits to the secondary are significant for the Chiefs at this point. Here’s a look at what each means for the team.

Deon Bush, Achilles

An Achilles injury is a very serious one, and it could signal the end of Bush’s season before it ever got going.

A longtime favorite of Dave Toub, Bush has been a reliable special teams player for the Chiefs for the last three seasons. On the defensive side, Bush is a limited safety who has seen decreasing snaps during his three-year stint with the Chiefs (although he never received many in the first place).

Bush was a likely candidate to make the practice squad if he didn’t land a spot on the team’s active roster, which didn’t seem likely with the presence of Mike Edwards behind young safeties like Jaden Hicks, Bryan Cook, and Chamarri Conner.

Jaylen Watson, concussion

Watson profiles as an obvious starter outside in the Chiefs’ secondary, so the loss of Watson for any length of time is going to be a major hit for a unit trying still trying to find the best ways to utilize everyone involved.

Unfortunately for Watson, he also suffered a significant injury last season and missed all but six games for Steve Spagnuolo’s defense after being forced to have surgery on his ankle.

Watson is coming into an important season, not only for the Chiefs’ defense, but on a personal level as well. In his fourth year, Watson is scheduled to hit free agency next spring and will make a lot more money on his second deal—whether with Kansas City or another NFL franchise.

The Chiefs have struggled to sort out their corners so far in training camp, because another assumed boundary corner, Kristian Fulton, has been forced to miss time on the team’s Physically Unable To Play list. Fulton only recently returned to practice following a dozen missed practices in training camp at St. Joseph.

With Fulton and Watson healthy, the Chiefs have the luxury to slide Trent McDuffie inside to man the slot corner role. That allows players like Nazeeh Johnson and Chamarri Conner to rotate as depth pieces, while third-round rookie Nohl Williams gets a chance to learn the ropes without being thrown to the wolves.

Concussion protocols are quite serious and will force the Chiefs to be cautious with Watson’s potential timeline and return, but there’s no doubt K.C. would take the same approach either way. The start of the regular season is still nearly a month away, when they face the Los Angeles Chargers in Sao Paulo, Brazil on Friday, September 5. That’s the only date that matters at this point.