He also scored once in four games as England's under-21 side reached the semi-finals of the European Championship last month.
The 19-year-old will join Swansea boss Paul Clement, who worked as a coach at Chelsea between 2007 and 2011.
Swansea, who finished 15th in the Premier League last season, open their 2017-18 campaign at Southampton on Aug. 12.
(Reporting by Hardik Vyas in Bengaluru; Editing by Mark Potter)
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