Alberto De Rossi's youngsters will return to Stadio Tre Fontane for the second leg with everything still to play for, after striker Celar cancelled out Marco Oliviero's penalty opener with just three minutes remaining.
The Slovenian forward headed home powerfully to give his side parity at the half-way stage in the tie.
The return leg takes place in Rome on Friday.
See more photos from the game at Vinovo in the gallery below.
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