The 17-year-old left-back has just started three Premier League games in a row for Saints which has coincided with a three-game unbeaten run. Two wins and a draw has won them seven points that have pulled them out of the relegation zone from second-bottom.
Lallana said: "The calmness he possesses for a 17-year-old is astonishing. He has got a great left foot on him and he has bedded in really well. He has got to keep up his fitness and he is going to go far in the game.
"There a big similarities between him and Bale. That is what people have been saying but he knows he has got to keep his feet on the ground and has a lot to learn but he is going to improve a lot with us, I can tell."