Watford will take on Union Berlin and Anzhi Makhachkala during a "private" pre-season tour of Austria, the club have announced.
The Hornets will travel to Europe over the weekend to begin a week-long training camp, during which they will play two friendlies against the teams from Germany and Russia.
They will face second-division German outfit Union Berlin at Stadion St. Andrä, a 2,300-seater stadium in the small town of St. Andrä, on Tuesday at 6pm local time.
Then on July 23 they will take on Anzhi, fresh from their first season back in the Russian First League, around 70 miles east in the village of Gralla, at the Sportplatz Gralla. Entry to the match is €10.
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