However, that run came to an abrupt end with a humiliating 6-1 defeat to Valenciennes.
Les Merlus battled back from 4-1 down to draw their last fixture at home to Ajaccio, but Gourcuff said that he was far from pleased with their first-half performance.
The 57-year-old said that a trip to the Stade Francis-Le Ble is "never easy" and he expects his team to be tested physically.
"This will be another tough game against a Brest side who are in need of a lift," Ligue1.com quotes Gourcuff as saying. "They need a good result, but so do we.
"The game against Ajaccio was an epic but, as good as our second-half performance was, we cannot forget the errors we made in the first half. And we can't forget our catastrophic performance at Valenciennes.
"Brest are a different type of opponent. It is always more of a physical battle when we go to Finistere. It is certainly never an easy game, and there is always a great atmosphere. But all that matters for the two clubs is picking up the points."
Gourcuff took charge of Lorient in 2003.