"Really the second opinion reconfirmed what we already knew," Callaway said. "He is going to go into rest until he is symptom-free and then start throwing."
The Mets' right-handed flamethrower went on the 10-day disabled list at the end of May with a strained ligament in his right index finger. Following a few days of rest, Syndergaard experienced some swelling after a round of catch last week and was scratched from his start on Sunday. Callaway said that Syndergaard's injury is still "tender to the touch."
Syndergaard, who is 4-1 with a 3.06 ERA and 76 strikeouts in 64 2/3 innings, got a second opinion Tuesday in an effort to gain a little peace of mind about the injury, according to the Mets' manager.
"It isn't that they don't trust the doctor that gave them the first bit of information," Callaway said. "It's just to reconfirm the hard news that you are getting because it's not fun to get that type of news."
As the days progress without an appearance on the mound, Callaway suspects that Syndergaard will have to make a rehab start before returning to the starting rotation.
"We have to see where it goes," Callaway said, "but it's probably getting to that point."
In the meantime, however, Callaway likes what he sees from the current set of Mets starters, saying that the group has earned the right for the team to lean on it in tough situations.
And he isn't wrong; Mets starters' 2.67 ERA since May 20 (22 games) is the lowest ERA in the Majors. Jacob deGrom and Seth Lugo are a big part of that, as the right-handers boast 1.57 and 1.77 ERAs, respectively, entering Wednesday.
"Our starters are getting the job done," Callaway said. "They have very good stuff. They are showing the ability to get through the lineup that third time through, so I think we can lean on them a little bit."
But the Mets' offense hasn't been able to support the strong effort from their starters, and New York has gone 1-9 in its previous 10 games. In four of the team's last seven games, the pitching staff has given up two or fewer runs, but the Mets only came away with one win.
"When [the starters] do their job," Callaway said, "we should be able to get them out and trust that the people behind them are going to come in and get the job done."
Mets claim Beck off waivers The Mets claimed right-handed reliever Chris Beck off waivers from the White Sox on Wednesday. Beck notched a 4.18 ERA with Chicago, giving up 11 runs on 24 hits through 23 2/3 innings, and he has pitched to a 5.94 ERA in 97 games over four MLB seasons, all with the White Sox.
"We need to put ourselves, as an organization, in the best chance to get as many quality players as we can," Callaway said of the decision to claim Beck. "I have seen this Chris Beck kid pitch quite a lot, and he's got some electric stuff. [He] probably hasn't figured it out to the point he would like to yet, but he's an interesting guy for sure."
Beck is expected to join the Mets in Arizona on Thursday for the start of a four-game set with the D-backs.
Tori McElhaney is a reporter for MLB.com based in Atlanta.