GLENDALE, Ariz. -- Injured Dodgers pitcher Zack Greinke said he plans to resume playing catch Friday, but manager Don Mattingly said the club is already contemplating backup plans if the $147 million free agent isn't ready for his regular-season debut April 2.

Greinke has inflammation in the back of his right elbow and received a platelet-rich plasma injection on Monday. He has made only two starts this spring for a total of five innings and would still need to throw a bullpen session before he returns to game action, most likely a week away.

All of that means he's unlikely to have enough foundation to pitch deep into a game by April 2.

"He wouldn't throw a 'pen until next week," said Mattingly. "We'll see how it goes, how he feels. We're not going to force anything. We've got different scenarios I'm not going to guess at, depending on how quickly he goes."

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