Leeds United are still said to be in talks with Club Brugge over a fee.
De Bock is also said to have interest from Belgian and Italian clubs, but currently favours a 'Championship adventure'.
According to HLN, the 25-year-old will be available for less than the €3 million (£2.7 million) Brugge paid for him five years ago, having been used sparingly this season.
De Bock is the latest left-back linked with a move to Leeds, who have been playing the right-sided Gaetano Berardi out of position since Charlie Taylor's departure last summer.
Manchester United loanee Cameron Borthwick-Jackson and Leeds academy product Tyler Denton are also available to head coach Thomas Christiansen, although Berardi - who conceded last month that the Whites need better player than him for the role - remains the Dane's preferred option.
The Sun newspaper reported on Friday that Southampton left-back Sam McQueen could join Leeds, Brentford or Reading, while the latter club are interested in Borthwick-Jackson, according to the Daily Mail.