Lomana Tresor LuaLua is aiming to win himself a move back to the Premier League by dumping Chelsea out of the UEFA Champions League.
The striker is expected to be in the Olympiakos squad against Chelsea when the Blues travel to Athens for their Champions League last 16 clash on Tuesday.
And LuaLua, who had spells with Newcastle and Portsmouth before moving to Greece in August 2007, insists Chelsea are in for a shock.
"I believe Chelsea will under-estimate Olympiakos and that is our biggest advantage," LuaLua told The Sun. "Everyone in England thinks they will walk all over us.
"They're in for a shock when they come to our stadium. I don't think Chelsea's players will have faced anything like it.
"The noise is like nothing they've ever heard. It's frightening. They will never have seen passion like the fans here have for their club. It's going to make a difference. It's truly out of this world.
"No-one is unbeatable. I watched my old club Portsmouth play Chelsea a few weeks ago. They drew but could easily have won. They had so many chances.
"We took Real Madrid to the wire at the Bernabeu. We drew with them at home and could have won, so the last thing in our minds is we'll lose against Chelsea."
The Blues have been tipped by many to stroll into a European quarter-final spot, but LuaLua is out to gun down Chelsea in a bid to earn himself a return to England.
"I miss England and would love to come back to the Premier League," LuaLua added.
"I am happy at Olympiakos. But I feel I have unfinished business in the Premier League."