Cubs manager Craig Counsell, left, and a team trainer check on Pete Crow-Armstrong during the sixth inning Saturday. AP

Pete Crow-Armstrong gave a thumbs-up while walking through the Wrigley Field clubhouse Sunday morning, signaling that he wasn’t worried about his right knee. The Cubs, though, are treating their all-star center fielder with caution, and it’s becoming clear that his condition is not the club’s only issue.

With three weeks to go until the end of the regular season, the Cubs are still solidly positioned to earn the National League’s top wild-card spot. But after keeping Crow-Armstrong and Kyle Tucker out of Sunday’s lineup, Chicago then watched closer Daniel Palencia blow the save in a 6-3 loss to the Washington Nationals. Palencia did not record an out in the ninth innin

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