The Red Devils saw off Club Brugge in the last round, with a 5-0 win at Old Trafford on Thursday sealing a 6-1 aggregate win.
Odion Ighalo netted his first Red Devils goal and Fred bagged TWICE after Simon Deli inexplicably got himself sent off for a crazy handball at Old Trafford.
Now Ole Gunnar Solskjaer’s side take on the Austrian Bundesliga side for a place in the quarter-finals.
LASK edged past AZ Alkmaar in the last round, drawing 1-1 in Holland before a 2-0 home win.
They topped Group D thanks to four wins, including all three at home against Bruno Fernandes’ old side Sporting, PSV Eindhoven and Rosenborg.
But despite their exploits this season, many Manchester United fans admitted they had never heard of the side that finished to Red Bull Salzburg in the league last season.
One Twitter user said: “What’s a ‘LASK’ lads?”
Another wrote: “Lask v Manchester United, not going to lie I know nothing about this team.”
And a third added: “LASK are Austrian…and that is where my knowledge of them ends.”
Meanwhile, Arsenal’s conquerors Olympiacos will be looking to cause more pain for the English sides in this season’s Europa League following their 119th-minute winner at the Emirates to dump the Gunners out.
They face Wolves in the next round after Nuno Espirito Santo’s side beat Espanyol 6-3 – despite Pedro Neto’s horrendous miss.
Istanbul Basaksehir will take on Copenhagen, who beat Celtic, while Rangers face a tricky tie against Bayer Leverkusen.