GER O'Brien expects his former St Patrick's Athletic team-mate Christopher Forrester to follow in the footsteps of previous League of Ireland exports Wes Hoolahan and James McClean and make a big splash across the water.
Saints captain O'Brien (31) got to see a young McClean up close as they were team-mates at Derry City for a season (2009).
He has more of an insight into Forrester (below), who joined Peterborough United from Pats earlier this month, as the pair have played together for a number of years, initially at Bohemians (2011) and then for four seasons with the Saints.
Forrester had a tough start to life in England, suffering a defeat in his first two games for the Posh, but since then Forrester has helped the side earn four points from two games, and O'Brien sees the potential for Forrester to go far.
"I would have really high hopes for Chris," says O'Brien. "Chris is still a kid, in terms of going over to England. I spoke to Chris before he signed for them, I told him that Wes Hoolahan was older when he made the move so this is a great opportunity for Chris.
"James McClean had a different work ethic off the pitch, compared to Chris. James was always in the gym, constantly building himself up and he had to work had to get to the level of ability you need.
"For Chris, that ability just came to him, he has the ability but he has to work hard as well. Now he is up against players who have been in league football in England for years, it's their bread and butter and you need something different to do well, but I think he has it."