PSG had a very difficult match against Lille. Messi was not comfortable at any time and, to make matters worse, the Argentinian was substituted at half-time.
Icardi came on in place of Messi, who, according to 'L'Équipe', was suffering from "muscular problems" after the match against Lille, the reigning Ligue 1 champions.
The alarm was raised at half-time, when Pochettino decided to change a key player in his attack, as he was being the most active alongside Neymar and Di Maria.