The Indianapolis Colts placed running backs Vick Ballard and Deji Karim on injured reserve as well as offensive tackle Ulrick John.
They also placed fullback Stanley Havili on the reserve physically unable to perform list.
The Colts have reached the 75-man roster limit.
Ballard rushed 224 times for 877 yards and two touchdowns, while catching 18 passes for 147 yards and a touchdown over the past two seasons.
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Aaron Wilson covers the Ravens for The Baltimore Sun