Hearts head coach Robbie Neilson fears he could lose full-back Callum Paterson's for six to eight weeks with a knee injury.
Hearts swept into the second round of the Petrofac Training Cup with a 3-1 victory over Annan Athletic at Tynecastle.
Manchester City ended their tour of Scotland with a 2-1 victory over Hearts at Tynecastle, whilte a Newcastle XI were defeated.
Former Rangers goalkeeper Scott Gallacher has signed a two-year deal at Hearts.
Prince Buaben has become Hearts' sixth summer signing after agreeing a one-year deal at Tynecastle.
Hearts head coach Robbie Neilson says he is satisfied with the progress being made by the team during pre-season.
Gary Oliver grabbed the winning goal as Hearts beat Dinamo Bucharest 2-1 in their opening pre-season game in Lancashire.
Rangers' clash with Hearts on the opening day of next season will kick-off Sky Sports' live coverage of Scottish football on Sunday, August 10.