Manager Don Mattingly said it is probably nothing major and pointed out that getting De La Rosa back this season is going to be an added bonus anyways with the pitcher only a year removed from Tommy John surgery.
"The good news is it's not his elbow," said Mattingly, who added it will not set his rehab back.
De La Rosa said his groin hurt on a couple pitches, but no MRI will be needed. Saturday night was his second rehab start and he struck out four in two hitless and scoreless innings.
The 23-year-old righty has been out all season after undergoing surgery, and he is being used as a starter to build up arm strength. However, Mattingly expects to use him as a reliever in September if he continues to progress and returns from the disabled list.
"I'm really excited," said De La Rosa, who added his velocity is where he wants it. "I can't wait."