The 20-year-old American forward made a surprise start in last Saturday's 2-1 defeat at Manchester City.
Robins manager Lee Johnson played with the England left-back during a loan spell six seasons ago.
Ian Wright has raved about the Liverpool star after his performance at the weekend.
Aston Villa have completed the signing of Mile Jedinak from Crystal Palace.
Arsenal have signed one established player this summer.
Leeds United have not won any of their first three Championship games.
Brendan Rodgers' side ran out 5-2 winners in the Champions League play off on Wednesday.
The Brazilian was the standout performer in the Reds' 4-3 opening day defeat of Arsenal on Sunday.
Arsenal legend pictured at Manchester United's training ground.
The one-time reported Arsenal target is staying with Leicester City.
During March, we've worked our way through a list of the greatest 30 players to ever play for Rangers - now it's time to find out who finished in top spot.
During March, we've worked our way through the greatest 30 players to ever play for Wolverhampton Wanderers - but who finishes in first place?
The Rotherham United boss was discussing his time at Leeds United.