Key players Alejandro Pozuelo and Mehdi Carcela were nowhere to be seen and only set pieces some small chances in the remainder of the first half, with both Christian Luyindama and Joseph Aidoo putting their headers off target.
The second half did not prove to be much better, Standard Liège started best with dangerous long distance kicks from Edmilson Junior and Collins Fai but still the match remained without a single effort on target.
It took until the very end of the second half before a first attempt on target was made, Joseph Aidoo almost headed in the winner on a corner kick, but a stunning reflex from Jean-François Gillet denied his effort.
In the extra-time, Standard Liège started furiously, with a back-heel pass from Paul-José M'Poku setting up Mehdi Carcela to give a perfect assist for Renaud Emond who headed in the ball past Danny Vukovic.
The game had also become extra fierce, forcing referee Jonathan Lardot to give several yellow cards, eventually even sending off Bojan Nastić just minutes before time.