Justin Fields is on his third team in as many years, learning his third offensive system in that span and working with his fourth offensive coordinator in five NFL seasons.

FILE - In this Oct. 26, 1998, file photo, Kansas City Chiefs quarterback Elvis Grbac throws against the Pittsburgh Steelers during the second quarter in Kansas City, Mo. The path from San Francisco to Kansas City is a well-traveled one for quarterbacks with four other passers besides Montana taking that route as starters. Here's a look at the QBs who have started for both San Francisco and Kansas City:STEVE DEBERGDeBerg began his NFL career with the 49ers in 1978 and was Bill Walsh's first starting quarterback in San Francisco the following year. JOE MONTANAMontana had his greatest success in San Francisco, helping establish a dynasty that won four Super Bowl titles in the 1980s. Kaepernick led San Francisco to the Super Bowl and the Niners dealt Smith to Kansas City.