Souza will serve as Seattle's designated hitter and No. 8 batter in Monday's game in Toronto.
Following Jarred Kelenic's recent demotion to Triple-A Tacoma, Souza appears to have settled in as a regular in the Seattle outfield. Though he'll be serving as a DH in Monday's series opener in Toronto, Souza manned right field in each of Seattle's three games versus the Mets over the weekend, going 2-for-11 with an RBI.