The Edinburgh side must overhaul a 2-1 first-leg deficit when FC Zurich visit Tynecastle Park on Thursday in order to reach the tournament’s group phase.
The aggregate winners of the play-off tie will progress, while the losers parachute into the Europa Conference League groups.
Haring knows Hearts face a difficult task against the Swiss champions but pointed out that much smaller clubs have reached the Europa League lately.
Dundalk of Ireland, Cypriot side Omonia Nicosia, Zorya Luhansk from Ukraine and Austrian club LASK Linz all featured in the 2020/21 group stage.
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