The Belgium under-19 international has been with the League One club since September and has made a huge impact on the first team.
He has scored twice in nine starts and five substitute appearances, including a goal in the memorable 8-2 FA Cup win over Droylsden.
Mpoku`s initial loan ended after the cup victory over Norwich on Saturday but he will now remain at Brisbane Road until May 31.
Source: PA
Source: PA