Tarps had to be laid down in the outfield due to leaking.
On Monday morning, the Blue Jays announced they were working with CN Tower staff and the Toronto Police Service to assess the conditions around Rogers Centre and determine whether the game can be played. They're expected to provide an update shortly.
Only once before has a game at Rogers Centre, with its retractable roof, been postponed. As it happens, the Blue Jays' series opener against the Royals on April 12, 2001, had to be rescheduled after metal fragments fell onto the field during a routine test of the stadium's roof.