The former Gambia U-20 boss was speaking to cafonline.com after a friendly with local side Real De Banjul in which his team came from behind to win 2-1.
The Telecom outfit had earlier registered a convincing win over Samger in the domestic league.
“The last two matches with Samger FC and Real De Banjul were good because we faced tough opponents”.
Gamtel will be looking to overturn a 2-1 loss from the first leg in Marrakech a fortnight ago.
“These two teams are very good on the ball and are similar to Khouribga, so playing them will help us for the second leg,” said Manneh.
The former defender believes the match with the Moroccan visitors will be a tactical master-class.
“I believe it's going to be a tactical game and our role will be to score and deny them from scoring. They are slow starters and they have skillful players, but we have to take advantage of their poor finishing in the closing stages.
“We're the underdogs in this tie so we're not under pressure. We aim to win and progress” Manneh concluded.