Dabo, a full-back, becomes the club's third signing of the summer, with his move following a spell on loan in League One with Swindon last season.
Lozano had flown from Kazan to the Netherlands after Mexico's 2-2 Confederations Cup draw with Portugal on Sunday.
Herculez Gomez believes Hirving Lozano's move from Pachuca to PSV will elevate the winger to the next level.
Mexico winger Hirving Lozano has temporarily left the team at the Confederations Cup in Russia to sign a contract with PSV Eindhoven.
Ajax have appointed Marcel Keizer as their new head coach on a two-year deal with the option of a third season.
Expansion franchise LAFC are reportedly seeking to sign star names in time for their MLS debut in 2018.