Question: The 2005–06 Serie A season for Inter Milan had a single European player on the roster during the Champions League group stages, that of the retired footballer of what nationality? 
Sentence (from "2013–14 PSV Eindhoven season"): The 2013–14 PSV Eindhoven season saw PSV competing in the Eredivisie, KNVB Cup, UEFA Champions League and the UEFA Europa League.
Relevant evidence: No