Feyenoord's management is aware of Brentford's interest in Milambo and believes that the London club will make an offer once Mbeumo's transfer is finalized.
Brentford plans to use the funds from Mbeumo's sale to help finance their potential move for Milambo.
Milambo is a 20-year-old midfielder who has represented the Netherlands U21 national team and has a contract with Feyenoord until 2027.