According to C Trent Rosecrans, the Reds have called up Neftali Soto and sent Tony Cingrani down to AAA. From CTR:

Soto’s been up once already this season, grounding out in his lone at-bat. The 24-year-old right-handed batter was hitting .278/.319/.428 with 11 home runs and 45 RBI for Triple-A Louisville, where he’s played third base, first base and DH.

Cingrani can still be recalled to make his planned start on Tuesday in San Francisco. Normally, players who are sent to the minors have to stay there for 10 days, barring an injury. The exception in this case relates to the double-header now scheduled in San Francisco on Tuesday. The collective bargaining agreement gives teams the right to call up a 26th player outside the 10-day rule. Cingrani will be that player. He’ll come up to pitch Tuesday then go back to Louisville. Then Cingrani will return for his regular turn in the rotation at the end of the ten day period.

This action by the Reds puts an extra bat (Soto) on the bench for the next ten days — eleven games, with the double-header. Cingrani won’t miss a start (although he will miss out on nine days of major league salary, to Soto’s benefit).

It’s a clever move.