#4 Julian Draxler
It is quite a mystery as to why Barcelona did not opt for a like to like replacement at the left wing. There were a lot of good players who were touted to join Barca but none could fit the bill as well as Julian Draxler.
The young German winger impressed one and all with his pace and dribbling ability during his time at Schalke, scoring 18 goals in 119 appearances in the process. A move to VFL Wolfsburg in 2015 did not turn out to be fruitful but his potential was enough to attract attention from the bosses at PSG.
With Neymar joining PSG and adding to the attacking talent already comprising of Edinson Cavani, Kylian Mbappe, Angel Di Maria and Javier Pastore, it was always going to be difficult for Draxler to find a place in the staring XI. In the limited opportunities that he got, Draxler netted 4 times in 17 appearances and made 20 key passes with a pass accuracy of 85%.
Had Barcelona gone in for a Neymar-Draxler swap deal, it would have given a chance to Draxler to express himself at a big club and would have been a like for like replacement for Barca, a win-win situation for both parties