They were talking about not letting Wheeler pitch until the 23rd when they announced he wouldn't go last Sunday, though that was before Sanchez got named to the All-Star team too.
Still not really down a player, you only need five starting pitchers in five days. But if one of Wheeler or Suarez can't pitch in the Twins series you have to make a move because then you are looking at another Mercado/bullpen start.
It's possible Suarez is the bigger question mark. It's also possible he could start Sunday. But Sanchez's outing last night was nothing so the only issue would be travel weariness and disrupted routine (last night didn't even count as a throw day really unless that happened in the pen).