The 20-year-old is yet to make an appearance for the Reds after completing a £8.5m switch to Anfield from Internazionale last week.
Lucas is well aware of the tests facing a young South American in the Premier League after the midfielder moved to Merseyside aged 20 in 2007.
The former Gremio star had fellow Brazilian Fabio Aurelio and Argentina international Javier Mascherano to help him settle upon his arrival – and Lucas is keen to make Coutinho comfortable at his new club.
He said: “He’s a great talent – a young player but with a lot of experience – and I’m really looking forward to playing with him and helping him to settle quickly in England.
“He doesn’t speak much English, so I will try to be his dad for a few months and hopefully he will be OK.
“I will just try to make him feel comfortable, the same way I did for Luis [Suárez] and Sebastian Coates.
“I’ve been here for a long time and it’s just what I feel I need to do and what I feel I have to do. Hopefully he will feel comfortable.”
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news