"To stop a rehab process when you're playing games is pretty significant," Counsell said. "I don't have any timetable or know what it means as far as a timetable, but it means we can't get over some humps, and it's been 45 or so days."
Santana will seek a second opinion on the injury.
Expected to be Milwaukee's everyday right fielder this season, injuries have limited Santana to just 40 games, in which he hit .234 with a .347 OBP and four home runs. Santana was placed on the DL with the elbow injury on June 10. In May, right shoulder soreness forced him to spend the minimum 15-day stint on the DL.
"It's a player that we were counting on [for] our Major League roster, certainly, that's going to now miss a minimum two months of time," Counsell said. "So that's significant. Obviously, you start looking at the timetable, and certainly we've got to make some progress to get back this year."
• Third baseman Will Middlebrooks hit the DL with a lower right leg strain sustained in Sunday's game against the Cubs. Middlebrooks left Miller Park on crutches following the game and returned still needing crutches on Monday. The Brewers expect his time on the DL to last more than the minimum 15 days. Outfielder Keon Broxton was recalled from Triple-A for his fourth stint with the Crew this season.
Curt Hogg is a reporter for MLB.com based in Milwaukee. This story was not subject to the approval of Major League Baseball or its clubs.