Lukes was placed on the 7-day injured list at Triple-A Buffalo on Sunday with a thumb injury, Shi Davidi of Sportsnet.ca reports.
The severity of the injury is unclear, but Lukes will be sidelined for at least the next week after he suffered the injury this weekend. The 28-year-old has a .333/.406/.480 slash line through 44 games for Buffalo this season.