Clemons, a 6-foot-2 wide receiver, was selected by the Steelers with the No. 231 pick in last month's NFL Draft.
During his senior season with the Buffaloes, he caught 43 passes for 680 yards and eight touchdowns. A native of New Kensington, Penn., Clemons spent his first two seasons in college at Michigan before transferring to Colorado.
The rookie should help bolster a shrinking wide receiver position for the Steelers. Following the release of veteran wideout Hines Ward, Pittsburgh has just four receivers on its roster in Mike Wallace, Antonio Brown, Emmanuel Sanders and Jerricho Cotchery.