Robertson is day-to-day with an upper-body injury, David Alter of The Hockey News reports Friday.
Robertson was absent from practice Friday after potting both of Toronto's goals the night before in a 2-0 preseason win over Detroit, and he's dealing with an upper-body issue ahead of Saturday's preseason finale rematch against the Red Wings. It's not yet clear whether his injury will impact his availability for Opening Night against Montreal on Wednesday. When he's healthy, the 23-year-old will likely take on a bottom-six role for the Maple Leafs.