Andrew Luck misses Friday practice, putting Week 4 status in real doubt

Two bits of news from Friday should have Indianapolis Colts fans nervous.

First, the Colts signed free-agent quarterback Josh Johnson to the active roster — a curious move this late in the week — with Andrew Luck listed as questionable for Week 4 with a shoulder injury.

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Second, Luck did not practice Friday (after being a limited participant on Wednesday and Thursday) in advance of the Colts' game against the Jacksonville Jaguars.

Luck never has a missed a game in his four-plus NFL seasons, but he's in real doubt for Sunday. Matt Hasselbeck, who celebrated his 40th birthday last week, would replace Luck and start his first game since Week 9 of the 2012 season, when he was a member of the Tennessee Titans.

With the Colts, Hasselbeck has completed 37-of-56 passes for 431 yards, two touchdown passes and one interception over seven games the past three seasons in mop-up duty.

Luck has been battered behind a shaky Colts offensive line this season, being hit 11 times alone in the home loss to the New York Jets, and was on pace for a career high in rushing attempt through three games. He has the league's lowest passing rating among full-time starters.

The Colts also signed another quarterback, Alex Tanney, to their practice squad earlier in the week.

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Eric Edholm is a writer for Shutdown Corner on Yahoo Sports. Have a tip? Email him at edholm@yahoo-inc.com or follow him on Twitter! Follow @Eric_Edholm