Sane has six goals and nine assists for the runaway Premier League leaders so far this season, and Gundogan believes that he is not yet at his peak. Quoted by FourFourTwo, he told UK Newspapers:
"He's really important for us, always doing the runs, so quick, so much pace. You can pass to him and be quite sure he's going to reach the ball."
However, Gundogan was quick to point out the areas where he thinks his City and Germany teammate can improve.
"If he's focused on doing the simple things as perfectly as possible, everything is reachable for him," He said.
"His first touch is always something he can improve. How he keeps the ball from the opponent, with his back to the opponent, showing stability, being strong in one-on-ones.
"I don't mean the offensive one-on-ones, trying to go to the opponents' box, but playing the short, simple passes in midfield.
"In the last third, there's so much potential in him. He has shown already he can score, assist, dribble – everything is there."
City are aiming to take their unbeaten run to twenty three games, and increase their lead at the top of the Premier League when they take on Liverpool at Anfield on Sunday.