Alli has emerged as a key part of the Tottenham team over the past two seasons and his 16 goals and five assists in the Premier League this season have helped propel Spurs to second in the table, seven points behind leaders Chelsea.
Alli celebrated his 21st birthday only this week and British media are inevitably predicting Spurs will face a battle to hang on to such a talented young player this summer.
"In terms of his ability, he could play wherever he wants. He has achieved so much in a short time that he must have great confidence in his ability to affect games at a high level," Bale said.
Read the full article on eurosport.co.uk: Bale ranks Tottenham's Alli among the world's greatest