Just 14, Sullivan is playing for the Philadelphia Union's reserve team this season.
Transfer expert Fabrizio Romano is reporting: "EXCL: Manchester City are closing in on deal to sign American wonderkid Cavan Sullivan, deal agreed!
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"2009 born talent set to join #MCFC in the next years from Ph. Union despite Real, BVB, Bayern interest.
"City Academy, doing excellent job on talents.
"Here we go, soon."