Manager Dave Roberts said that X-rays on May's foot came back "inconclusive" and that May will have to undergo further testing Friday, Bill Plunkett of The Orange County Register reports.
May has already been diagnosed with a foot contusion, according to Ken Gurnick of MLB.com, but it sounds like there's a chance the injury is worse. The right-hander will be evaluated again Friday, at which point the club should have a better understanding of the extent of the injury.