The Indianapolis Colts just received a big blow after learning that safety Julian Blackmon is done for the season due to injury. Blackmon sustained an Achilles injury during practice ahead of Sunday's matchup against the San Francisco 49ers in Santa Clara and will no longer see any action this year, according to an official announcement by the Colts.

Blackmon has started in all six games for the Colts this season, and his loss only adds to the problems of the team's pass defense that hasn't been doing very well.

The Colts are just 20th through six weeks with 255.5 passing yards allowed per game and third-worst overall with opponents completing 71.94 percent of their passes. On top of that, the Colts are also 29th in terms of pass DVOA (Defense-adjusted Value Over Average), ahead of Week 7.

With Blackmon gone for the rest of 2021, Indianapolis will need someone in the secondary to step up and cover the void he left. Before going down with the devastating lower-body injury, Blackmon had recorded 34 tackles and a forced fumble for the Colts.

Blackmon was selected by Indianapolis in the third round of the 2020 NFL Draft and was signed by the team to a four-year deal worth $4.62 million.