The person spoke on condition of anonymity Wednesday night because the Chiefs have not announced the deal. Fanaika still must pass a physical for it to be complete.
The Chiefs were looking for help on the offensive line after losing three starters to free agency last offseason, and then watching starting center Rodney Hudson sign a five-year, $44.5 million deal with AFC West rival Oakland this week.
Fanaika was a seventh-round draft pick of the Eagles in 2009, when Chiefs coach Andy Reid was in charge. He's come into his own in Arizona, starting all 30 games he played in over the past two seasons.