Question:
Who was the head coach of the team Olympiacos F.C. in Nov, 2008?

Context:
 Alberto Bigon is the head coach of Olympiacos F.C. from Nov, 1999 to Apr, 2000. 
 Pedro Martins is the head coach of Olympiacos F.C. from Apr, 2018 to Aug, 2022. 
 Ernesto Valverde is the head coach of Olympiacos F.C. from Jun, 2008 to May, 2009. 
 Míchel is the head coach of Olympiacos F.C. from Sep, 2022 to Dec, 2022. 
 Carlos Corberán is the head coach of Olympiacos F.C. from Aug, 2022 to Sep, 2022.

Answer:
Ernesto Valverde