The Belgian has played the last two seasons with Inter Milan.
Romelu Lukaku is set to complete his move from Inter Milan to Chelsea today.
The Belgian striker is to rejoin the London club, this time for 115 million euro.
The 28 year old has scored 64 goals in 95 games for Inter Milan.
Chelsea manager Thomas Tuchel feels the Champions League winners can mount a serious challenge for the Premier League title.

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