Mike Trout, the Angels' superstar center fielder who has been hampered by a litany of injuries in recent years, suffered a torn meniscus in his left knee that will require surgery.

The Angels did not announce a timetable for Trout's recovery while revealing the injury Tuesday, but sources familiar with the situation said a best-case scenario could be four to six weeks. A true timeline, however, can't be determined until doctors take a closer look at Trout's knee. Surgery is expected to take place at some point this week, with a source indicating it could happen Friday.

Texas Rangers right-hander Max Scherzer was scratched from his second scheduled rehab start Tuesday because of thumb soreness.

The soreness is similar to what Scherzer experienced last year before being sidelined for the end of the regular season and the start of the playoffs for the World Series champion Rangers.