The Astros placed Abreu on the restricted list Monday.
Manager Joe Espada said Monday that Abreu is dealing with a personal matter, per Mitch Bannon of The Athletic reports. It's unclear whether the reliever could rejoin the team before the end of its series in Toronto, or if it's likelier Abreu meets the Astros later this week in Detroit. Logan VanWey was promoted from Triple-A Sugar Land to replace Abreu on the active roster and in the bullpen.