The time is now for Ange Postecoglou to make his make on Europe as Celtic boss.
In Group G, the Premiership side and visitors Ferencvaros are the only teams sitting without a point.
To reach the knockout stages of the Europa League is looking like a mammoth task, but to even secure third and a Europa Conference League spot a win over the Hungarians is a must.
With three competitions to compete in this term, both Postecgolou and fans would have expected the European run to continue into 2022.
Therefore, winning the home clash with Peter Stoger's men is a must ahead of the return fixture in Budapest next month.
Ferencvaros stunned Celtic with a 2-1 victory in a Champions League qualifier at Parkhead last term. So, the warning signs are there for the Australian in Glasgow's east end.
Going into the pivotal fixture, both Bayer Leverkusen and Real Betis have the chance to all-but guarantee a spot in the last 32.
Off the back of their 5-1 mauling at the hands of Bayern Munich, Bundesliga side Leverkusen travel to Seville with both clubs sitting on six points.
With both sides holding a vastly superior goal difference to Celtic and Ferencvaros, hitting the nine point tally should be enough to secure safe passage.
Manuel Pellegrini's Betis then travel to Germany next month, offering another chance for the two teams to put the latter stages of the Europa League out of reach.
For Postecoglou, three points on Tuesday would kickstart the campaign. Realistically to reach the next round the Celtic Park boss will require an unbeaten run until the end of the campaign to leapfrog Betis or Leverkusen.
However, Leverkusen comfortably saw off Celtic in Glasgow, and Betis have already edged out the Hoops in a 4-3 thriller.
That means two wins from two against Ferencvaros, and a win and a draw as a minimum against the Spanish or German giants.
Securing third spot would guarantee a place in the Europa Conference League.
The double header with Ferencvaros will likely decide who will take their place in UEFA's newest competition.
Celtic vs Ferencvaros odds with Grosvenor Sport
Celtic 13/20
Draw 11/4
Ferencvaros 17/4
*odds subject to change
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