United travel to two Slovakian sides, MFK Ruzomberok on Tuesday, July 13 and MFK Kosice on Friday, July 16.
The newly-promoted Whites will then return to England to play at Bury and then Hartlepool on July 20 and 24 respectively.
Leeds then travel to Norway to face Lyn Oslo on Tuesday, July 27, followed by a home game against Premier League Wolverhampton Wanderers on Saturday, July 30.
Source: BBC Sport
Source: BBC Sport