Chelsea has agreed to sell key midfielder, Pierre-Emerick Aubameyang, to Lille for a reported €35 million.

Chelsea Football Club has announced that it has reached an agreement with Lille for the transfer of Pierre-Emerick Aubameyang, who is set to join the French club on a four-year deal.

The news comes as a significant blow to Chelsea's season, which was already struggling without star striker Diego Costa, who left the club in January. Aubameyang, who is widely regarded as one of the best strikers in the world, joins the Blues after spending six seasons at Arsenal, where he scored 186 goals in 224 appearances.

Aubameyang's arrival at Lille will be a major boost to their attack, which currently features several players who have struggled to find their form this season. The 32-year-old Gabonese international is known for his clinical finishing and ability to score from distance, making him an ideal fit for the French champions' attacking playstyle.

While Aubameyang's move to Lille is a setback for Chelsea, it also provides an opportunity for the Blues to focus on rebuilding their squad ahead of next season. With the loss of Costa, who had been crucial to the team's success over the past few years, the club may need to make further signings in order to compete for honours in the coming months.

Overall, the departure of Aubameyang is a big loss for both Chelsea and Lille, but it remains to be seen how the two clubs will manage without the services of the highly rated Gabonese striker.