I am a Liverpool player known for my versatility, often filling different roles as needed. I've had a unique journey to Anfield, coming from a South American club and developing into a key squad member. Who am I?

1. I am not primarily a forward, but I can contribute goals.
2. My national team jersey is often yellow.
3. I've played in both midfield and defensive roles.
4. My arrival was not initially met with high expectations.