La Dea have reached the final four by defeating Liverpool 3-1 on aggregate.
Percassi said: "We had a particularly unfortunate draw against Liverpool, but overcoming one of the strongest teams in the world gives even more flavor to the passage of the round, we're very happy.
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"If I like Marseille? We're happy, any other city would have been great. On evenings like this you think about all the work that has been done in the past, it's very nice in which all the protagonists individually gave their best, but this was the victory of the whole of Atalanta.
"What we are looking for as the Percassi family is to give our best for this club."