Marcus Christenson for The Guardian:
What he does provide, though, is an unrelenting work ethic. In that respect, he is similar to Luis Suárez and Alexis Sánchez. He will harry and press the opponents until he drops. In one match report in Germany he was described as the “clever, first stealer of balls in Hoffenheim’s pressing system”.
Holger Stanislawski, his first manager at Hoffenheim, immediately described him as being “unbelievably good tactically”, which will be music to Brendan Rodgers’ ears after a season of having to teach Mario Balotelli, among other things, how to defend at corners.