The 33-year-old central defender becomes the club's second signing of the January transfer window following Jonas Gutierrez's arrival from Newcastle
The 33-year-old central defender, who spent eight years at Everton, has been playing in the Turkish Super Lig since August 2010.
Yobo becomes Norwich's second signing of the January transfer window following Jonas Gutierrez's arrival from Newcastle, which is also a loan deal until the end of the campaign.
Chris Hughton's side currently sit 12th in the Premier League, five points above the relegation zone but have won just once in their last eight league matches.
“It’s the same as everybody else. We’re still working hard, and will continue to do so right up until the last moments,” the Norwich boss said when asked about potential transfers on Thursday.
“If we’re able to do something then that would be great, but if we’re not then we have a competitive squad, and as I’ve said before we’ve got players who have been reintroduced to that squad.
“Anthony Pilkington and Alex Tettey were both involved on Tuesday, and of course there are always going to be other players coming back into the squad from injury over the course of the season.”