Serrano (shoulder) was activated from the 60-day injured list Tuesday.
Steele will begin a rehab assignment with Triple-A Iowa on Wednesday, Taylor McGregor of Marquee Sports Network reports.
Ramirez isn't in the starting lineup for Monday's game against the Brewers due to back spasms, Taylor McGregor of Marquee Sports Network reports.
The Mets are planning to activate Hagenman (rib) from the 60-day injured list to start Wednesday's game against the Rays at Tropicana Field, Mike Puma of the New York Post reports.
Baty is out of the lineup for Monday's game against the Rays.
Happ is absent from Monday's starting lineup against Milwaukee.
Conforto is not in Monday's lineup against the Brewers.
Ramirez is out of the lineup for Monday's matchup with the Brewers.
The Mets activated Vientos (hand) from the 10-day injured list Monday. He'll start at designated hitter and bat cleanup in the series opener versus the Rays.
Soto is out of the lineup for Monday's game against the Rays, Max Goodman of NJ.com reports.
