A lot has changed for Romelu Lukaku since the last time he pulled on a Chelsea shirt as a 20-year-old back in 2013.
He has played for three clubs in two countries, cost a total of almost £300m, scored 193 club goals and become Belgium's all-time top goalscorer.
His 24 Serie A goals - and 11 assists - last season helped Antonio Conte's Inter Milan to their first title in 11 years.
But why have Chelsea broken their own transfer record to lure the 28-year-old back to Stamford Bridge? And is he the man to help bring the Premier League title back to the European champions for the first time since 2017?