Lampard, now 36, has had a long-running association with Chelsea since signing for the club from West Ham in 2001, and went on to make a mockery of the £11m fee paid by the Blues. With just shy of 650 appearances for the club and 211 goals, Lampard became the club's all-time record goalscorer in 2013, forever writing himself in Chelsea folklore.
Yet after a 13 year spell at Stamford Bridge, Lampard's time at the club came to and end this summer after Chelsea took the decision to not extend the England international's contract. A big money move to Australia was mooted, but Lampard confirmed his next destination last month - New York City FC.
The MLS franchise, owned by Manchester City, have already snapped up one big name player in former Barcelona and Atletico Madrid forward David Villa, and have now made another blockbuster move with the arrival of Lampard.
However, with New York City only set to enter MLS in 2015, Lampard has around six months without football. Villa has already joined Melbourne City on loan, and now Lampard will join Manchester City - who own both New York City and Melbourne City.
Despite the confusion and ensuing controversy over Lampard joining one of Chelsea's rival, Blues boss Mourinho says that the experienced midfielder is free to sign for whoever he wants - and will always be welcomed back to West London when the two teams meet.
"He is a free agent, he can choose his club so there’s no problem at all," said Mourinho. "When he comes to Stamford Bridge he is welcome."
With Cesc Fabregas brought in to replace Lampard's goalscoring, the 36-year-old has been swiftly replaced, and having been let go at the end of his contract, it's hard for Chelsea fans to really take issue with Lampard's career choices - no matter how much it hurts.