The Danish international was close to moving to Stadio Artemi Franchi before the Serie A Champions made their late move for the striker on Friday
The 24-year old striker had a medical in Turin on Friday ahead of a move to the Old Lady, but according to Antonelli it could all have unfolded very differently but for a late twist of fate.
"It seemed an impossible operation, but we had an agreement with Arsenal and with the player," he told Sky Sports Italia:
"It seemed like a dream, but, at one point, it looked as if we had him. The interest from Juventus changed the scenario, [however]."
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“Having chosen Juve, he still phoned our president out of respect. He, and his agent, behaved in the right way," he added.