Move motivated by money and status, he probably wants to be more of a key figure which he will get at Chelsea as things kinda getting stale for him at Citeh.
Pretty good run for him at Citeh, like KK7 mention above second behind Augero in goals and he is second behind KDB in assists during his time and won everyone except for UCL (which might be more likely to win with Chelsea
)
Interested to see what kind of production he gets playing a different role which be similar to the role he would play with England playing off strikers as attacking midfielder.
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