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"): Despite a good first half (also including a 3–2 win in derby, that lacked since 2002) Inter did not have a great second half, and knocked out in the Champions League by Villareal.
Relevant evidence: No