The 45-year-old replaces Ray Wilkins as Carlo Ancelotti's right-hand man. Wilkins left Stamford Bridge last week for undisclosed reasons.
Emenalo joined Chelsea in 2007 and has been working as the club's Head Opposition Scout.
He represented Nigeria as a defender at the 1994 World Cup and played for clubs including Molenbeek in Belgium, England's Notts County and San Jose Clash in the United States.
Get the best features, fun and footballing frolics straight to your inbox every week.
Thank you for signing up to Four Four Two. You will receive a verification email shortly.
There was a problem. Please refresh the page and try again.