In their first season without Andrew Luck, the Indianapolis Colts finished 7-9. Their third-place finish in the AFC South comes one year after finishing 10-6 and advancing to the Divisional Round of the playoffs.

While disappointing, the 2019 season presented many takeaways for the mediocre football team. If the Colts want to return to the postseason next year, they should address the following issues this offseason.

5. Indy should move on from Adam Vinatieri

Adam Vinatieri is a future Hall of Fame kicker, but it's time for him to hang up his cleats. In 2019, the NFL's all-time points leader connected on fewer than 70% of his field goals and 90% of his extra-point attempts for the first time. At 47 years old and 24 years into his NFL career, Vinatieri is on his last legs.

At this point, there is nothing left for Vinatieri to prove. He is one of, if not the most, clutch kickers in history. The three-time first-team All-Pro has already won four Super Bowls, and he won't win another with Indianapolis. There's nothing left for him to gain in the NFL.

On the other hand, the Colts cannot bring back Vinatieri in 2020. He only made 17 of 25 field goal attempts and 22 of 28 extra-point tries in 2019. The kicking was detrimental to Indianapolis' success. The Colts need a new kicker.

4. Wide receiver depth is an issue

T.Y. Hilton is a stud and is underappreciated by fans outside of Indianapolis. However, the Colts lack a worthy second option in their receiving corps.

The team hoped Devin Funchess would provide the position with some juice, but he landed on injured reserve after Week 1. Funchess never made a significant impact in his first four seasons anyway, despite mostly serving as Cam Newton's top wide receiver.

With Hilton missing six games in 2019, Zach Pascal led the Colts in receiving yards with 607. However, he only averaged 37.9 receiving yards per game. Those are numbers fitting for a team's third receiver, not the top option.

With Jacoby Brissett already struggling, the Colts need to add a talented receiver this offseason or pray Parris Campbell breaks out in 2020.

3. The secondary needs a lot of work

Indianapolis allowed 248.9 passing yards per game in 2019, which ranked 23rd in the NFL. While teams can win with that secondary, it adds a lot of extra pressure on offenses and defensive fronts. The Colts cannot afford to have a weak secondary right now.

Against Indianapolis, opponents completed 70.1% of their pass attempts. Only the Los Angeles Chargers (70.7%) allowed a higher completion percentage. Quarterbacks averaged a 98.0 passer rating against the Colts as well, which was the seventh-highest permitted rating in 2019.

While Pierre Desir and Malik Hooker aren't bad players, they cannot serve as the best players in Indianapolis' secondary. The team needs upgrades at cornerback and safety.

2. Indianapolis must re-sign Anthony Castonzo

Quenton Nelson is Indianapolis' only superstar on the offensive line, but Anthony Castonzo is just as important.

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While the veteran left tackle is already 31 years old, the Colts are not prepared to replace him, and he still can play at a high level for years to come. Offensive linemen can perform well in their mid-30s. Andrew Whitworth made All-Pro teams at age 34 and 36 just a few years ago.

A first-round pick in 2011, Castonzo transitioned from a disappointing pick to an admirable anchor with the Colts. Even if he demands big money this offseason — which he can, considering how much teams paid Trent Brown and Nate Solder — Indianapolis should try to keep Castonzo.

1. Jacoby Brissett isn't the answer?

2019 provided more questions than answers for Jacoby Brissett. He posted a respectable 99.7 passer rating until leaving the game against the Pittsburgh Steelers. After returning from that injury, Brissett wasn't the same. During the final seven games of the season, Brissett threw four touchdowns, three interceptions, and posted a 75.0 passer rating.

The question for Indianapolis' front office and coaching staff now is, which version was the real Brissett? Is he the man that led the Colts to a 5-2 record through the first seven games, or the man who went 2-5 during his last seven starts? With one more year left on Brissett's deal, the team could wait and see or make a play for one of the many available veterans this offseason.

The Colts don't need a quarterback as good as Luck, but they do need a reliable player at the position. Right now, most are undecided on whether Brissett can be that man.