Haber, 19, who will be on trial on the tour, has played for Dutch club FC Gonigen at U-19 level and is regarded as one of Canada's brightest prospects.
Gary McAllister has taken 21 players on the trip, including Rui Marques who missed the friendly draw at York on Friday night after international duty.
Bradley Johnson, who suffered a hip injury late in that game, recovered sufficiently to make the trip but Tresor Kandol has missed out with a virus.
Neil Kilkenny is also absent as he is re-joining Australia's Olympic squad after turning out the KitKat Crescent.
Kilkenny said:"If the lads start well it will be hard for me to get straight back in, but hopefully I did enough last season to show the manager I am good enough to play and get straight back into the team."
The Whites open the tour at Galway United on Wednesday evening.
Leeds Squad: Ankergren, Lucas, Martin, Richardson, Gardner, Michalik, Huntington, Marques, Sheehan, Parker, Prutton, Hughes, Douglas, Howson, Johnson, Sweeney, Robinson, Bayly, Beckford, Showunmi, Haber.