The former Trojan had the number passed on to him from the late Junior Seau. He went on to wear the number for his entire USC career and throughout his NFL career as well.
"Junior is the godfather, to me, of that number and he is the reason I wore 55," McGinest said.
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Following the spring game, USC head coach Steve Sarkisian was asked about the number as well as McGinest's comments.
"It's a little bit of a miscommunication," Sarkisian replied. "I probably dropped the ball there, so we'll fix it."
Asked if the No. 55 will continue to be worn by an offensive player, Sarkisian responded "probably not."
"It's a great number and it's a historical number," Sarkisian said. "A lot of great players have worn that number and hopefully as we move forward we continue to have great players to put that number on.
"It's a great deal of respect to guys like Junior and Willie and Chris Claiborne and Keith Rivers, all of those guys. A lot of great guys have worn it."