Nadal's publicist, Benito Perez-Barbadillo, said Tuesday that the six-time Grand Slam title winner is in Barcelona for tests on his sore knees.
Perez-Barbadillo says Nadal is "slowly recovering from his injury."
He says Nadal will return to practice Monday and will play in the hard-court tournament at Montreal that begins Aug. 10.
Nadal has not played a match since being upset in the fourth round at the French Open in May. He did not defend his Wimbledon title and slipped from No. 1 to No. 2 in the rankings.
Davydenko rallies to advance to 2nd round