The Phillies placed Alvarez on the restricted list Monday as he deals with a personal matter, Matt Gelb of The Athletic reports.
It's not clear at this point how long Alvarado will be away from the club. The lefty reliever has had an up-and-down season and has mostly struggled since the All-Star break, posting a 5.40 ERA and 12:9 K:BB over 13.1 innings. Michael Mercado was called up from Triple-A Lehigh Valley to take Alvarado's spot on the active roster and in the bullpen.