They were virtually eliminated from the champions league which is why di Matteo was axed, he was never really given much credit for winning it tbh and was more like a figurehead with the players running the team. I'll give you the league facts shortly
They weren't virtually eliminated, they were eliminated. Rafael only had 1 champions league game with them, which they won 6-1.
Roman didn't want to hire DiMatteo in the first place, but due to him winning the champions league as caretaker manager, fan pressure led to him being offered the full time job. In fact Rafael was approached that Summer to take over and the first sign of weakness from DiMatteo, Roman hired Rafael literally the same day.