The 23-year-old was allowed to leave Mexico's pre-Olympic training camp last weekend in the hope of securing a deal with a Spanish club, but he still remains a Tottenham player.
The Mexican, who has been linked with Sevilla, Real Betis and Atletico Madrid, hopes that will change soon, however. And he told ESPN Radio: "I want to return to Spain. There is a new coach at Tottenham, a new season is starting and it is clear to me that I want to return to Spanish football."
He added: "I think that I will be able to announce the move soon."
Dos Santos, who cost £4.7 million four years ago, has accused Tottenham of pricing him out of a move.
"Tottenham have always tried to sell me for double the price that they paid for me," he said.
"There are offers, but nothing can be made public yet."