New York Mets Brandon Nimmo was placed on the DL with a partially collapsed lung. Nimmo was initially hospitalized, but has now been released. There are multiple reasons why this could happen. If the partially collapsed lung is compromising his breathing then he would require his chest tube. If not, they will watch and wait. Usually 2 to 4 weeks to return to play for moderate-to-severe types. 1 to 2 weeks for milder types.