The Cubs placed Merryweather on the 15-day injured list Tuesday due to right knee tendinitis, Taylor McGregor of Marquee Sports Network reports.
It's unclear when the injury first surfaced, but Merryweather surrendered four runs over one inning during his last appearance Sunday in Miami. The right-hander is without a clear timeline for his return but will be eligible to rejoin the active roster during the second week of September.