Bale has been on an extended break after helping Wales reach the semi-finals of Euro 2016, but is apparently due to return to training on Friday, according to the Spanish paper Marca.
He has been spotted mountain biking in Marbella while Zinedine Zidane's side have been tuning up for the new season in North America.
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He has been leaving in the mornings to ride on a MTB Rockrider 5.3 - from the sports brand Decathlon - whilst sporting a pair of Hawkers sunglasses," said Marca in a report on Tuesday. "And furthermore the Welshman has also been working out in the gym during his time off.
With Cristiano Ronaldo out with his knee problem after the Euro 2016 final, Madrid will be keen to start Bale in the traditional match between the Champions League holders and Europa League winners.
Real Madrid lost 3-1 to Paris Saint-Germain in Ohio, but were 3-2 winners against Chelsea in Ann Arbor in their recent friendlies.
They face German champions Bayern Munich on Wednesday in New Jersey in the final match of their US tour.
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