NEW YORK -- Mets second baseman Neil Walker has been diagnosed with a herniated disk in his lower back that has caused some weakness in his ft.The initial medical recommendation is that Walker will do no additional damage by playing through the issue. Still, Mets officials and Walker are playing it safe by having another doctor review the MRI on Wednesday before potentially having him return to the field.Walker has missed the past three games because of the latest flare-up of the back issue. He experienced a similar issue, including the ft weakness, back in 2012 while with the Pittsburgh Pirates.Anytime you have a back issue, you can be symptomatic in various ways, Mets general manager Sandy Alderson said. He doesnt have any pain. There is some weakness but not significant enough to prevent him from playing. I think the big concern is: Can he further injure his back? Thats the reason for the second opinion.Alderson suggested anybody portraying the injury as career-threatening is uninformed.I think the currently circulating story is a little overblown, Alderson said. Based on the information we have currently, Neil can play. And the notion that what he has currently is career-ending is a fabrication at this stage. I dont want people to become t concerned about where we are, but were getting a second opinion, as we do in a lot of these cases, and well know more today. But as of right now, we dont think its as serious as has been portrayed.Hes got a disk [issue], which is pretty routine, the GM continued. So were not talking about something thats career-threatening in my judgment, based on what Ive heard from the doctors.Mets manager Terry Collins said the weakness caused by Walkers herniated disk is causing numbness in one of his feet and that is what is keeping him from playing.So we are waiting for the second opinion to find out if surgery is necessary immediately. If not, are we waiting? How long? Hes got to get some strength back in his leg in order to play, Collins said. So, yes, he could play. But do we take him out in the sixth inning? The other night it flared up on him. We end up winning the game, and he said, Im not sure I could have gone extra innings.That is where we stand right now. Until the second opinion comes back, we are hesitant to put him out there.Walker isnt the only player getting an additional medical review on Wednesday. Steven Matz is having his balky left shoulder re-examined. The Mets had hoped Matz would return from the disabled list to make a start on Thursday, but an impingement is still leading to rotator cuff irritation.Alderson said there is no immediate thought to shutting down Matz for the remainder of the season, despite the fact Matz already will require offseason surgery to remove a bone spur from his pitching elbow.Im pleased with the way in which these issues have been handled, Alderson said. Steven has pitched through the elbow issue over the last couple of months admirably. We certainly are going to be very careful about the shoulder, just as we have, I think, been about the elbow as well. Were not at the point yet where we say, Lk, it doesnt make any sense to continue. Until a doctor tells us that or we determine that in discussions with Steven, hes still part of the team.Alderson insisted the mounting injuries have not been frustrating given the teams play of late. With young pitchers such as Seth Lugo and Robert Gsellman having stepped into the rotation, the Mets (68-64) have moved to within 2? games of the St. Louis Cardinals for the National Leagues second wild-card spot.Were 8-2 the last 10 games, so its a little hard to be frustrated, Alderson said. Its challenging for Terry and the staff. Its challenging for the players. Its challenging for us. But, as an organization, I think were meeting the challenge. Well see what happens over the next 10 games, but Im very pleased with the way some of our young players have stepped up.Alderson did not rule out acquiring a reliever on Wednesday -- the final day a player can be obtained from outside the organization and be eligible for the postseason roster. Still, Alderson did not portray such a scenario as likely.Were still working on it, he said. We still have some things that are going on. I dont really expect that well be able to do anything significant. Its possible that well do something. 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