The Nigeria international completed a loan move from Fenerbahce during the January transfer window, and arrives at Carrow Road with the club in 15th place - just two points clear of the relegation zone.
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"I'm excited that I had this opportunity to come back to England," he told the club's official website.
"It's probably the best league in the world, and it's a new challenge so I'm looking forward to it.
"There were loads of clubs from abroad who were interested in me, but the manager here convinced me and I wanted to come back to the Premier League."
Yobo is ready to play an immediate part in Norwich's fight to avoid the drop, and says he had settled in nicely to his new surroundings.
"We had a week break for Christmas in Turkey, but then two weeks of training after that and it was so good, so I'm ready to go," he added.
"I trained yesterday but today it was with the whole squad so I'm happy to be here. I know a few of the players already, it wasn't entirely new to me but I felt welcome."