Lang has been in red hot form for Club Brugge since joining from Ajax last summer, scoring 21 goals and providing 15 assists from 50 appearances so far.
The 22-year-old’s performances for Club Brugge have seen him attract transfer interest from several clubs, while also earning a call-up to the Netherlands national team.
Leeds were heavily linked with a move for Lang in the summer, but eventually signed Daniel James from Manchester United just before the transfer window closed.
Arsenal are now linked with being keen on a swoop for Lang, but they face competition from Italian giants AC Milan.
According to Belgian daily Het Nieuwsblad, AC Milan have identified Lang as an ideal candidate to strengthen their squad.
However, the Italian giants are yet to formalise their interest in Lang by making a formal offer to the player or Club Brugge.
While AC Milan are tipped to make an offer soon, it is said that Club Brugge will not consider selling Lang for less than €30m.