Castaignos made his Europa League debut in a 1–0 win over Gent, coming on as a substitute.
Jean-Luc Godard | Luc Besson | Jean-Luc Ponty | Luc Plamondon | Luc-Normand Tellier | Jean-Luc Picard | Luc Longley | Luc Tuymans | Luc Soete | Luc Recordon | Jean-Luc Nancy | Luc Montagnier | Jean-Luc Grand-Pierre | Luc Van Acker | Luc-sur-Mer | Luc Sante | Luc-Olivier Merson | Luc Delahaye | Luc Côté | Le Luc | Jean-Luc Moudenc | Jean-Luc Mélenchon | Luc Van Lierde | Luc Salvas | Luc Jacquet | Luc Chikhani | Luc Boltanski | Luc Bernard | Jean-Luc Marion | Jean-Luc Lagardère |