With League One Brentford in such good form, Forrester believes the prospect of a different kind of west London derby would play into his side's hands.
"Griffin Park has become a fortress and they won't like to come here," said the midfielder, who featured in Saturday's 2-2 draw at Roots Hall. "Of all the smaller clubs they could have drawn we'll be one of the hardest.
"Hosting players such as Eden Hazard and Juan Mata will obviously be surreal for us but we're a good side. We've had a fantastic season and, if it were to happen, it would be an amazing next chapter for us.
"For all our players it is going to be the chance to test ourselves against the very best and I think that's what we'll look forward to the most. The players are buzzing.
"Clearly it would be an amazing day for the club to host the European champions and we'll be using that as motivation to see off Southend."