As we continue looking at potential 2021 free-agent targets, lets delve into every Met fans’ favorite concern — the bullpen.

Like much of the potential roster for 2021, the Mets will need to bolster an area of need that could be without Justin Wilson and Dellin Betances (without ever throwing a pitch as a Met).

With Seth Lego left as the only reliable late-inning performer, the Mets will need much more than hoping the Familia/Diaz duo can regain some of their past dominance to compete in the NL East.

This crop of will-be and could-be free agents has a bunch of intriguing names that should certainly be on the Mets radar if they want to contend in 2021.

5) Alex Colome`

This up and down closer should get some traction with potential suiters.

The right-hander spent the last two seasons in Tampa Bay/Seattle and then the White Sox, where he pitched to a sub 3.00 ERA in both 2018 and ’19 for the Mariners and Chi Sox.

In his age 30 season, Colome` appeared in 62 ballgames for Chicago saving 30 games — but a closer look shows less than stellar metrics with 23 BBs, a 4.08 FIP, 164 ERA+, and just 8.1 K/9.

Despite command issues and some inconsistency’s, Colome`still presents a live arm that for the right deal could turn into a home run for New York.

4) Blake Treinen 

After a disappointing 2019 that saw a major step back from his dominant 2018 campaign, the Dodgers scooped him up on a one-year deal hoping he’ll reclaim his recent success in Oakland.

Treinen compiled one of the best relief-pitching seasons in recent memory as an Athletic in ’18.

In 68 appearances, the right hander pitched to the tune of a microscopic 0.78 ERA with 38 saves, a 531 ERA+, 0.83 WHIP, 11.2 K/9, and 100 strikeouts in 80 IP.

2019 saw those numbers balloon to pedestrian level, but injuries hindered Treinen down to 58 innings. All things considered, the would-be 33 year old still presents a ton of upside that could pay-off big for the Mets.

3) Dellin Betances

This native New Yorker presents a truly unique conundrum for the Amazin’s.

Obviously, Betances was signed as a free agent for 2020 after coming off an achilles injury for the Yankees in 2019, but could end up never throwing a pitch in Queens.

Betances does have a $6 million player-option for ’21, and if the big-right hander is fully healed — that could turn out to be a steal for the Mets.

Even if he does declare for free agency, they would be smart to bring Betances back on another one or two-year deal to bolster the late-innings.

2) Sean Doolittle/Justin Wilson

With Wilson set to become an unrestricted-free agent for 2021, the Mets will be in need a quality-left hander out of their bullpen.

The reasonable choice (as of now) would be to bring back Wilson, who proved to be one one of the few reliable arms besides Seth Lugo.

Although the south paw spent time on the injured list in ’19, in 45 appearances he threw to a 2.54 ERA with 10.2 K/9 — showing success in taking care of both left and right-handed batters.

Another intriguing option from the left-side is 2019 Mets’ pitching machine (only joking) Sean Doolittle.

Doolittle (along with the rest of the Nationals bullpen) struggled for a good portion of ’19, but somehow righted the ship for the stretch run and road that momentum all the way to a World Series championship.

A 4.05 ERA and 63 hits (including 11 home runs) allowed in 60 IP doesn’t exactly move the needle, but Doolittles’ overall body of work as a high-leverage reliever, coupled with his fantastic postseason performance for the Nats (a sub 3.00 ERA in 9 appearances) makes him an enticing signing.

1) Kirby Yates

The 33 year-old Padres’ right-hander will surely be the one of the most coveted relievers on the free-agent market.

Yates burst onto the scene with San Diego at the age of 30 in 2017, striking out an astonishing 14.1 K/9 in 55 IP.

2018 and ’19 saw even more success for Yates, posting 2.14 and 1.19 ERAs consecutively in at least 60 IP in both seasons. The strikeouts kept coming too, with K/9s of 12.9 and 15.0.

Yates also proved that he could be a reliable full-time closer, saving a major-league leading 41 saves in 2019.

At 34, it will be interesting to see how the market looks at Yates as a long-term investment, but if he is willing to be a “gun for hire” on a short-term deal, the Mets should be jump to the front of the line and make his signing a priority.