Speaking ahead of the Blues' return to Premier League action, Rosenior emphasised that such setbacks are an essential part of a young player's education. He revealed that Sarr's response on the training pitch has been perfect, showing the mental fortitude required to play for a club of Chelsea's stature.
"I’ve worked with Mamadou for nearly two years and I'm so excited for his career – that's why he's here," Rosenior told, as quoted by the club's official website. "But sometimes you have to go through negative experiences to improve. He will come back. He trained very well [on Thursday] and he's a massive part of our plans moving forward."