The Indianapolis Colts were supposed to be Super Bowl contenders going into 2019, but Andrew Luck's sudden retirement weeks ahead of the season started threw a wrench into those plans

Under Jacoby Brissett's direction, the Colts went 7-9 and missed the playoffs. In Brissett's defense, Indianapolis' offense was ravaged by injuries, but apparently, the Colts powers-that-be did not like what they saw from Brissett.

As a result, the Colts signed Philip Rivers this offseason, which has created considerable buzz. But does Indianapolis have enough to make a serious run at a playoff berth?

Here are the three biggest questions for the Colts entering 2020:

3. Can this defense be top 10?

The Colts were already a decent defensive team going into the offseason, but they then bolstered their unit even further by swinging a trade for stud defensive lineman DeForest Buckner.

Buckner will join a group that already includes Justin Houston, Darius Leonard and Malik Hooker, so Indianapolis has a group of talented defenders.

Good defense is not something we are accustomed to seeing from a Colts franchise that has long favored offense, but now, things are beginning to even out. The question is, can this defense creep into the top 10 in the NFL?

Buckner is definitely good enough to make a big impact, and so long players such as Houston and Hooker stay healthy, Indianapolis' defense could be a force.

2. Who will be the No. 2 receiver?

The Colts were hoping that Devin Funchess would be their No. 2 receiver behind T.Y. Hilton in 2019, but a collarbone injury ended Funchess' season after just one game.

Now, Indianapolis has a cast of young wideouts vying for that role, ranging from Parris Campbell to incoming rookie Michael Pittman Jr.

It's been a while since the Colts have had two top wide receivers, so perhaps one of the youngsters can complement Hilton and get Indianapolis back to its Marvin Harrison-Reggie Wayne glory days.

Zach Pascal is also worth keeping an eye on after he caught 41 passes for 607 yards and five touchdowns in what was a breakout campaign for him this past year.

Indianapolis certainly doesn't have a shortage of candidates to fill that No. 2 role; someone just needs to step up and deliver.

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1. How much does Philip Rivers have left?

There is a reason why the Los Angeles Chargers decided to move on from Rivers.

The 38-year-old had a shaky season in 2019, throwing 23 touchdowns and 20 interceptions. Yes, he threw for 4,615 yards and completed 66 percent of his passes, but he clearly lost zip on his arm, which led to many of those turnovers.

It's not like Rivers didn't have weapons in Los Angeles either, as the Chargers boasted a stable of pass-catchers that included Keenan Allen, Mike Williams, Hunter Henry and Austin Ekeler.

Rivers won't have those same weapons in Indianapolis, but perhaps playing in a dome will help him rebound. Also, the Colts' offensive line is considerably better than what Rivers had in L.A., so that should assist him, as well.

We'll see if Rivers has at least one more run left in him. If he does, the Colts could end up winning the AFC South.