McCown has spent time with the Cardinals, Lions, Raiders and Panthers. He started 13 games in 2004 for the Cardinals and 9 for the Raiders in 2007.
Over his NFL career, McCown has completed 610 of 1,058 passes for 6,584 yards, 35 touchdowns and 40 interceptions.
McCown played with the UFL's Hartford Colonial last year where he was league's leading passer with a rating of 79.3.
McCown will wear #9 with the 49ers and compete for the third quarterback spot on the team.
More San Francisco 49ers News
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No sign of Nick Bosa or Trent Williams at 49ers' Thursday practice
The San Francisco 49ers took the practice field on Thursday for the second session of the week, with one more practice scheduled for Friday before hosting the Chicago Bears at Levi's Stadium on Sunday. However, two key starters—defensive end Nick Bosa and tackle Trent... -
49ers mailbag: What do the 49ers have left in the tank for the last four games? Will SF bring back Robert Saleh? Can Brock Purdy beat good teams?
It's always a big week when the San Francisco 49ers play the Los Angeles Rams. In 2021, the rivalry became even bigger when the 49ers had to win in the season's final week, in Los Angeles, to make it into the playoffs. On Thursday night, the 49ers must win again to keep their... -
Report: Nick Bosa likely to make his 49ers return against the Rams
San Francisco 49ers defensive end Nick Bosa, listed as questionable for Thursday night's primetime matchup against the Los Angeles Rams, is likely to play, according to ESPN's Adam Schefter. However, the team will assess his readiness during pre-game warmups to ensure he can... -
49ers vs. Bears final injury report: Williams won't play, Bosa doubtful
The San Francisco 49ers are preparing for their Week 14 contest against the Chicago Bears on Sunday at Levi's Stadium in Santa Clara, California. Both teams have released their official injury reports, which are provided below. San Francisco 49ers Out LB Dre Greenlaw...