The Belgian striker was on hand to tuck the loose ball home after Navas failed to gather fellow new boy Matic's effort.
Check out the video for yourself below.
2-1 in #supercup2017 now, Lukaku pulls one back for Man Utd, can #RealMadrid hang on pic.twitter.com/Ib92JMy3ly
— iBleeedFootball (@iBleeedFootball) August 8, 2017