With the prognosis on Lucas Duda‘s back not looking good at the moment, it seems like it’s not a matter of if but when Duda is placed on the DL. When that happens, the Mets are going to have to make a move on the 40-man roster.

The Mets are not likely to call up either Brandon Nimmo or Dilson Herrera. Both are performing well at AAA, but both players are also seen as possible everyday players. It’s likely the Mets aren’t going to call them up, wasting service time, just so they can sit on the bench. No, the Mets are going to have to make move to call up either T.J. Rivera or Ty Kelly.

Early reports are that it may be Ty Kelly. There’s some logic to this move. Terry Collins seemed enamored with him during Spring Training. He’s hitting .391/.478/.548 in AAA. He’s played every position, but catcher in his career. Yes, that includes him pitching one scoreless inning in 2014. He’s earned this call-up.

Problem is so has T.J. Rivera. He’s hit .375/.406/.569 in 20 more plate appearances. He was just named the PCL’s Offensive Player of the Week. So far this year, he’s played first, second, third, and left.

Like Kelly, he’s a gap to gap line drive hitter with doubles power. They’re both 27 year old AAA utility players whose value is predicated on their bats. Neither are great defenders. Neither have a set position. Overall, there’s very little separating Kelly and Rivera.

The case for Kelly is he’s a switch hitter who’s been known to have an exceptional eye at the plate. This year, Kelly already has 19 walks. In his minor league career he has walked 505 times and struck out 504 times. While he’s struggled the past two plus years in AAA, he seems to be putting it together this year.

However, Kelly has played the vast majority of his time in left field this year, and the last thing this Mets team is another outfielder. With that said, he has primarily been an infielder prior to this year. Of note, he has only played four games at first base. Overall, while Kelly has had a nice year at the plate, he isn’t exactly what the Mets would need if Duda went on the DL.

If the Mets truly wanted a backup infielder, they would go with Rivera. He has played all but one of his games in the infield this year. While he doesn’t have Kelly’s eye at the plate, he strikes out less frequently. Rivera also typically gets more extra base hits.

There’s another important reason to call up Rivera. This is Rivera’s sixth season with the Mets organization after signing with the team as an undrafted free agent. He has improved his game each and every year. He has gone from a minor league depth player to being on the cusp of the major leagues. Calling him up would be a moral boost to every player in the organization. It’s a sign to every minor leaguer that if you continue to work on your game and continue to improve, you are eventually going to get a shot at playing in the majors.

Is that why Rivera should be called up over Kelly? Of course not. However, with so little separating the two of them, you might as well call up the infielder in whom you have invested six years. It’s time to call up T.J. Rivera especially with the Mets running out of excuses to keep him in the minors.