Tuchel had earmarked the youngster , 21 , as the man to succeed Henrikh Mkhitaryan ahead of his move to Manchester United .
The club fell short , much to the German boss ' frustration .
Tuchel had earmarked the youngster , 21 , as the man to succeed Henrikh Mkhitaryan ahead of his move to Manchester United , yet the club fell short , much to the German boss ' frustration .