Highmore (upper body) is now considered week-to-week according to coach Bruce Boudreau, Brendan Batchelor of Sportsnet 650 reports.
Based on his timeline, Highmore figures to miss at least the next three matches for the club due to his upper-body issue. Prior to his absence, the 26-year-old recorded just one point in his last 12 contests while registering just 15 shots. Recent call-up William Lockwood figures to continue deputizing in Highmore's stead.