Chesterfield have confirmed that striker Armand Gnanduillet has joined Leyton Orient for an undisclosed fee.
The Ivorian joined the Spireites in 2013 after a successful trial and went on to score ten goals in 84 league appearances for Chesterfield.
He was part of the side that won the League Two title in 2013/14.
Chesterfield chief executive Chris Turner said: “Armand always gave his best for Chesterfield and we saw on several occasions the qualities he can bring onto the field.
“There was interest from a number of clubs for Armand and we felt it was right to allow him to leave as we were unable to guarantee him first team football.
“We wish Armand all the best in his career and thank him for his efforts with our club.”
Danny Wilson’s Chesterfield, currently 18th in League One, face eighth-placed Millwall at the Proact this afternoon.
Winger Gboly Ariyibi is back after serving a one-match ban following his red card at Rochdale.