Life in the NFL goes by at the blink of an eye, and the knee injury suffered by the Colts starting CB Marlin  Jackson yesterday illustrates that principle to a tee.

According to ESPN’s Adam Schefter, Jackson was injured on the final play of the team’s practice on Wednesday, and was later diagnosed with a torn ACL (anterior cruciate ligament) in his knee. The remainder of his season will be finalized in the near future, as Indianapolis is almost certain to place Jackson on the injured reserve list.

Jackson is likely to have surgery to repair the tear sometime next week, but his future with the Colts is somewhat murky at this point, given his status as a free agent next spring. Suffering an injury like this is definitely not a good way to convince a club to extend a better contract offer, so  Indianapolis will probably be able to re-sign him at a much lower cost than initially projected.

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2. Welker leaves field on cart with knee injury