Chelsea captain Gary Cahill says he has been impressed by Romelu Lukaku’s development as a player since leaving Stamford Bridge, according to Goal.

The former England centre-back played alongside an 18-year-old Lukaku in West London and believes now, as a 25-year-old striker at Manchester United, the Belgian is world class.

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In the build-up to the FA Cup final on Saturday, Cahill said:

It’ll be difficult. I’ve played against him and trained against him loads of times, when he was here he had talent but he was very young. He’s developed into a world-class striker so credit to him.

Lukaku will likely return into Jose Mourinho’s starting eleven for the FA Cup final after injury, and the Chelsea defender is more than aware of his strengths.

What everyone can see – pace, power, strength and he can finish. His goalscoring record is very good. But we’re not focusing on one player in this team.

This match is the last chance for both sides to win some silverware this season and the Chelsea players have the extra motivation of coming up against their old manager.