JACKSONVILLE, Fla. -- Daniel Jones helped spark a massive turnaround in the Indianapolis Colts ' offense through the first half of the season.

Now, as Indianapolis sputters to the finish line, Jones will be a spectator.

The Colts quarterback, who helped engineer an offense that was on a record trajectory through eight weeks, suffered a season-ending Achilles tear in the first quarter of Sunday's 36-19 loss to the Jacksonville Jaguars , sources confirmed to ESPN. He's set to undergo surgery.

The injury and the subsequent defeat leave the Colts in a daunting situation, with a rookie backup quarterback under center, a brutal stretch run ahead and dimming playoff hopes.

"That's our team leader, our team captain," wide receiver Alec Pierce said. "It's brutal."

Jones dropped back

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