Rangers 3–3 Villarreal on aggregate. Villarreal won on away goals.
Werder Bremen 4–4 Juventus on aggregate. Juventus won on away goals.
Barcelona won 3–2 on aggregate.
Milan won 5–2 on aggregate.
Lyon won 5–0 on aggregate.
Arsenal won 1–0 on aggregate.
Benfica won 3–0 on aggregate.
Internazionale won 3–2 on aggregate.
Internazionale 2–2 Villarreal on aggregate. Villarreal won on away goals.
Milan won 3–1 on aggregate.
Barcelona won 2–0 on aggregate.
Arsenal won 2–0 on aggregate.
Arsenal won 1–0 on aggregate.
Barcelona won 1–0 on aggregate.
References
2005–06 UEFA Champions League knockout stage Wikipedia(Text) CC BY-SA