McDonald, whom the 49ers selected in the second round, could compete for playing time right off the bat for San Francisco, which lost Delanie Walker in free agency. According to Pro Football Focus, Walker played 589 regular-season snaps a season ago for the 49ers, with Vernon Davis — the Niners’ top tight end — logging 942 snaps, per PFF data.
A Rice product, the 6-foot-4, 267-pound McDonald caught 120 passes for 1,513 yards and 15 touchdowns in four seasons with the Owls. He was the No. 55 overall pick.
Adam Caplan of TheSidelineView.com first reported McDonald’s signing.
The 49ers also confirmed the signing of defensive lineman Tank Carradine, their other second-round selection in the 2013 draft.