"I didn't get a real in-depth report measured against Vargas' injury to know which one was more severe," Green said, "but it's definitely like, 'Sit tight for a few weeks, get treatment, therapy, start building it back up.'
"[We will] probably re-evaluate him here in a few weeks and find out where he is before he starts throwing."
Johnson struggled in his first four starts with the Padres, posting a 9.15 ERA while allowing nine home runs in 19 2/3 innings. Johnson felt discomfort when throwing a curveball in the last inning of his start on Tuesday against the Orioles.
Carlos Collazo is a reporter for MLB.com based in San Diego. Follow him on Twitter @CarlosACollazo. This story was not subject to the approval of Major League Baseball or its clubs.