Tony Mowbray takes his squad next week for a fitness camp in the north-east of the country, which will be supplemented by games against two top flight Turkish sides and one from Croatia.
The first game is on Thursday July 14, when Boro take on Istanbul BB FC in the Stojnci Stadium, Markovci, to the south-east of Maribor.
They follow that with a trip to northern Croatia to take on Varteks Varazdin in Varazdin on July 17.
The final game is on July 19 against Turkish outfit Antalyaspor in Dravograd, which is to the north-east of the capital, Ljubljana. All games kick-off at 6pm.
Boro fly out on July 13 and return July 21, two days before the first of three friendly games in this country, at Darlington on Saturday, July 23, kick-off 3pm.
Their next game is away to Carlisle on Tuesday, July 26, with a 7.45pm kick-off, before they conclude their warm-up programme against Dutch side PSV Eindhoven at the Riverside Stadium on Friday July 29, also at 7.45pm.