The 25-year-old Hungarian joins the Lilywhites on a deal to July having featured in Wednesday's pre-season friendly with Shanghai Shenxin.
A statement on the Italian side's website this morning indicated the deal was imminent and Dundalk have since confirmed the news.
While never making a competitive first-team appearance for Liverpool, Adorján has gone on to forge a career for himself, firstly in the Netherlands with FC Groningen where he made 19 appearances, scoring three times. The attacker transferred to Novara in 2014, playing 19 times before moving to Albanian side FK
He will add to Stephen Kenny's attacking options for the season ahead.