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 "2005–06 Inter Milan season"): The 2005–06 Serie A season opened with success in the Supercoppa Italiana, beating Juventus 1–0 in extra time with a goal scored by Verón.
Relevant evidence: No