"That's conjecture at this point", Alderson explained. The Cuban outfielder is recovering from an injury in his left hamstring but he suffered a minor setback this weekend while he was on his rehab assignment after feeling a right quad soreness, which only allowed him to play one more time for Port St. Lucie.
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Late Saturday night, Mets officials announced that Cespedes experienced discomfort but no possible issues had been mentioned just hours earlier by Collins.More news: Merkel warns against "simple answers" after Trump meetings
Collins said when Cespedes returns he will want to play in every game but the team can not afford to have him sidelined for another month therefore he will be getting periods of time off.
"He's an extraordinary athlete and we need to make sure that he maintains that athleticism and does so on a day-to-day, week-to-week basis", said Alderson.
Matz has not made a major league appearance this season after being diagnosed with elbow inflammation near the end of spring training.
Matz, who is recovering of a flexor strain in his left elbow, threw very well on Sunday, while he pitched five ideal innings in his third rehab assignment, which included eight strikeouts.More news: Trump makes G-7 deal on trade, takes rain check on climate
Lugo, on the other hand, earned three runs over six innings in his last outing in Double-A Binghamton, along with eight hits, two walks and seven punch outs.
The 26-year-old was a sight for sore eyes during his triple-A rehab start for Las Vegas on Sunday.
After stepping in last season for a depleted Mets pitching staff, Lugo appeared in 17 games in 2016, going 5-2 with a 2.67 ERA.More news: Philippines official: Terror suspect still in besieged city