Olayinka and his Slavia Prague teammates held Arsenal to a shock 1-1 draw at the Emirates in the first-leg last Thursday.
But a brace from skipper on the night Alexandre Lacazette and a goal each from Bukayo Saka and Nicolas Pepe secured a 5-1 aggregate win for the Gunners.
They will now face Samuel Chukwueze’s Villarreal who knocked out Dinamo Zagreb.
The Yellow Submarines beat Dinamo 2-1 in the reverse fixture to advance 3-1 on aggregate.
Also, the semi-final clash against Villarreal will see Spanish coach Unai Emery come face to face against former club Arsenal.
The 4-0 win against Slavia Prague is Arsenal’s biggest European away win since a 5-1 Champions League victory over Inter Milan in November 2003
Also they ended Slavia Prague’s 33-game unbeaten run at home.
At Old Trafford, Manchester United progressed into the last four after defeating Granada 2-0. United also won the first-leg 2-0.
An Edison Cavani opener and an own-goal by Vallejo sealed the win for Ole Gunner Solskjaer side.
And in Italy, AS Roma were held to a 1-1 draw by Ajax but qualified 3-2 on aggregate and will face United in the semi-finals.
By James Agberebi
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