Tomas has hit.268 through 305 games in three big-league seasons, with 48 homers and 163 runs batted in.
"We'll continue to work with him, continue to believe in him and continue to need him in big situations", Boone said.
"You want to play, especially the home opener in front of your crowd", Wade said.
But after starting a season 2-0 for the first time since 2011, the Yankees split the four-game series in Toronto after wasting a three-run lead in Sunday's 7-4 defeat.
Lopez is 8-6 with a 4.81 ERA in 19 career games, including 14 starts, with the Washington Nationals and the White Sox in 2016 and 2017.
"You can't do any better than he did today", said Toronto manager John Gibbons. Warren left Saturday's game after he was struck by a comebacker.
Reliever Adam Warren became the second Yankee to leave the field with an injury after taking an Aledmys Diaz comebacker on the inside of his ankle in the sixth inning. In the New York City area, LaGuardia, Kennedy and Newark Liberty airports all reported some flight disruptions. Outfielders Jacoby Ellsbury (strained right oblique) and Clint Frazier (concussion) are also on the DL.
Austin had tied the game an inning earlier, sending a first-pitch offering from Estrada into the second deck in centre field.