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The Manchester United player was travelling to Portugal to join the squad for their Nations League matches against Poland and Croatia.
The 39-year-old former Sporting CP manager is one of the exciting head coaches in Europe.
The Dutchman has left Manchester United with the club placed 14th in the Premier League standings.
Forlan will team up with current world No. 101 Federico Coria of Argentina in the main draw at the clay court Challenger Tour event in Montevideo after being given a wild card.
Huerzeler, 31, has overseen two victories to keep Brighton provisionally top of the standings after two games
Man United supporters are expecting better than their eighth-placed finish last term.
Erik ten Hag's team looked on course to repeat their shock victory over City in the FA Cup final when Alejandro Garnacho put United ahead after 82 minutes, but City midfielder Bernardo Silva netted a minute from time to send the match to penalties.
Manchester City, who are aiming for an unprecedented fourth consecutive English top-flight title, can retake the lead when they play at Arsenal's London rivals Tottenham Hotspur on Tuesday.
Casemiro missed a spot kick for United in the shootout but they hit back and Rasmus Hojlund's penalty sent them into the final against Manchester City.
Silva sidefooted the ball home in the 84th minute after Chelsea goalkeeper Djordje Petrovic parried a shot from former Blues midfielder Kevin De Bruyne.
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