Given Harvey's recent struggles, it's likely he'll be released.
Scott Boras, Harvey's agent, said in a text message that the bullpen was tough for Harvey to work on all of his pitches.
The designation will occur on Saturday, Alderson said.
Harvey had Tommy John surgery on his elbow following the 2013 season, causing him to miss the entire 2014 campaign. It worked at the time, as he pitched to a 3.04 ERA in four starts throughout their World Series run, but he has not been the same since. He was solid after returning to 2015, but has seen his numbers sharply decline over each of the last two seasons-posting ERA's of 4.86 and 6.70 in 2016 and 2017, respectively.
After Harvey is designated, the Mets have seven days to trade him or release him. His 2.71 ERA ranked sixth in the National League. In eight appearances this season (four of them starts) he allowed 33 hits and 21 runs across 27 innings, CBS Sports reports.
That continued into this year, as Harvey now has an ERA of 7.00 in 27 innings.
We'll keep you updated on the latest Harvey news.
But as Mets starters Jacob DeGrom and Noah Syndergaard emerged as top pitchers, Harvey fell off, and the Mets' trio hasn't become the dominant force many hoped or expected. Since losing his rotation spot, he has a 10.50 ERA in four relief appearances.
Selected by the Mets with the seventh overall pick in the 2010 amateur draft, Harvey made his big league debut in July 2012 and became a major sports figure in NY - both at the ballpark and at Manhattan night spots.
Alderson told reporters Friday that he, manager Mickey Callaway and pitching coach Dave Eiland met with Harvey and pitched him on the idea of rebuilding himself in the minor leagues.