Lille winger Eden Hazard flew to England to attend Manchester City's 1-0 win over Manchester United on Monday.
The 21-year-old recently admitted his desire to move to the Premier League at the end of the season, with City and United understood to be leading the race.
It is not yet clear whether there has been any official contact between the player and either club, but developments are expected over the coming weeks.
Hazard has scored 19 goals in 44 games for Lille this season.