"Had a great summer but can not wait to get back in to the season and challenge for undecima #HalaMadrid," he tweeted.
Madrid clinched a famous 10th European Cup in 2014 when Bale scored the winner in the final against Atletico Madrid.
GETTY
Gareth Bale has suggested he wants to stay at Real Madrid next season
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United are known suitors of the ace as manager Louis van Gaal seeks to spend his £150m summer transfer hoard.
But the club may instead move to secure Thomas Muller's transfer this pre-season and push for Bale once again next summer.