Martinez's crisp finish put Inter ahead before they saw a second goal chalked off and Slavia instead awarded a penalty, which Tomas Soucek converted to tee up a draw that would do little for either side.

But late strikes from the outstanding Lukaku and Martinez secured the precious points for Inter as they bid to reach the knockout stage.

Antonio Conte's men are second in Group F on seven points, ahead of third-placed Borussia Dortmund on head-to-head.

Inter will qualify if they beat Barcelona in a mammoth San Siro showdown on matchday six, while Dortmund host bottom side Slavia and hope for a Nerazzurri slip-up.