Kevin De Bruyne's 70th-minute goal helped City secure 56 points from 22 matches with Chelsea on 43 points.
Lukaku becomes the second most expensive player in Premier League history after his return to Chelsea from Inter Milan.
Inter remain four points ahead of second-placed Milan, who got back to winning ways in Rome after consecutive league losses including last weekend's derby defeat.
Milan launches straight onto the attack from kick-off, with Turkish midfielder Hakan Calhanoglu setting up forward Rafael Leao to slot home the rapid opener.
Sevilla clinched the Europa League title with a 3-2 win over Inter Milan after an overhead kick by defender Diego Carlos deflected by the Italian side's top scorer Romelu Lukaku settled a thrilling contest.
The Italian giants are now one win away from their first trophy in nine years.
Italy has displayed another weekend of racism at the football pitches as Hellas Verona supporters lobbed offensive chants at Franck Kessie and a TV commentator’s racist comment directed at Romelu Lukaku.
Manchester United's Marcus Rashford and Porto's Alex Telles score penalties in extra time to help their teams win 3-1 against PSG and Roma respectively in the football Champions League round of 16 matches.
Racism in football is a reflection of a wider problem in European society of institutional racism and discrimination. Can Europe evolve and become accepting or will it retreat in fear at the confidence displayed by immigrants.
Belgium held off five-time champion Brazil 2-1 on Friday and reached the World Cup semifinals for the first time in 28 years. They will face neighbours France in St Petersburg on Tuesday.
Manchester United suffers a shock exit in the last 16 after Sevilla substitute Wissam Ben Yedder strikes twice at Old Trafford.
A 14th straight victory for City is a record run in a single top-flight season while Liverpool were off the mark as Wayne Roney equalised for Everton.
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