The 15-year-old winger has quickly established himself as one of the most exciting youngsters in MLS over recent months.
The 21-year-old Canadian international left-back previously trained with the Championship club last December.
The former Newcastle United youngster was released by Birmingham City earlier this summer.
The 29-year-old defender is open to joining the MLS club permanently after being released by Birmingham City last month.
The 21-year-old Canadian centre-back spent five years at Rangers before being released by the club this summer.
The 20-year-old winger made his full debut for Benito Floro's side in Friday's 1-1 friendly draw with Azerbaijan.
The 18-year-old Canadian defender was involved in Chelsea's matchday squad for the first time on Wednesday night when he made the bench for the 1-1 draw at Liverpool.
The 22-year-old's display at right-back in Friday night's 3-0 World Cup qualifying defeat to Mexico was roundly panned.
The West Ham United defender had a difficult night at right-back as Benito Floro's men lost 3-0 in their first World Cup qualifier of 2016.
The 25-year-old made his first senior international appearance in Tuesday night's 1-1 friendly draw with Ghana.