O/T - A good pub quiz question

A and B are two footballers who played for Club 1 post-2000
Both players left 1
A went to Club 2 and won the league
B went to Club 3 and also won the league
Clubs 2 and 3 are rival clubs
A and B then reunited at Club 4 before player A returned to Club 1
Players A and B have both won the Champions League

Name A, B, 1, 2, 3 and 4?????