Barcelona head into the match searching for their first away win of the season and will be big favourites to pick up three points against the newly-promoted side.
However, Martinez says he has belief his team can pull off a shock result although he knows it will be a tough challenge.
“A lot of things differentiate Granada and Barcelona, we both belong to very different universes,” he said.
”I visualise the match in a positive way, I see us winning, although I’m aware of the difficulties that come with facing one of the best teams in the world.
”We’re going to have to work a lot, run very hard and squeeze the maximum out of ourselves, but we have a belief that anything can happen.”
Source | Marca
Granada have enjoyed a decent start to the season back in the Spanish top flight. They kicked off with an entertaining 4-4 draw at Villarreal, were narrowly beaten 1-0 by Sevilla but have gone on to pick up wins against Espanyol and Celta Vigo.