He held managing spells at PSV Eindhoven, Sporting Lisbon, FC Porto, and FC Barcelona, where current Chelsea coach Jose Mourinho worked as his translator.

CNN: Sir Bobby Robson taken to hospital

The 30-year-old striker, who spent three seasons with Celtic, previously played for FC Twente and PSV Eindhoven.

BBC: Hartley and Dutchman leave Celtic

In Group K , unbeaten PSV Eindhoven went three points clear at the top with a 1-0 win at home to Denmark's FC Copenhagen, as Jonathan Reis made up for having his first-half penalty saved by Johan Wiland when he fired in a 72nd-minute decider.

CNN: Benfica put five past weakened Everton