Bills Hall of Famer Andre Reed is siding with Cam Newton in his spat with Buffalo WR Kelvin Benjamin ... telling TMZ Sports, K.B. needs to end the fight and focus on the season!!
Cam and Kelvin nearly came to blows before their preseason game Thursday when Newton confronted Benjamin about calling him a sorry QB to reporters.
Cooler heads prevailed ... but the beef seemed far from over when the two separated -- and now, Andre's callin' for Benjamin to end it.