Barcelona coach Quique Setien felt his side had put themselves into a positive position after leaving Napoli with 1-1 draw from the first leg of their Champions League last 16 tie.

Antoine Griezmann struck what could prove to be a crucial away goal for the LaLiga side in the second half, which cancelled out a fine opener from Napoli midfielder Dries Mertens.

The Italians, who had won four of their last five Serie A matches, made the most of a promising start when Mertens curled in a 20-yard effort after 30 minutes.

The Barcelona coach added: "We will have more options in the second leg, as it is unlikely a team will be able to defend for that long at Camp Nou.

"So we have got to think positive and cannot complain."

Setien accepts Barcelona must now focus on how they can adapt without two key men out through suspension.

"We will not be able to count on Sergio Busquets or Vidal for the return, but we will find solutions to compensate," he said.

On Vidal's sending off, Setien commented: "A yellow card for the foul is one thing, but the second is too much. There are moments of tension that players who experience the game with his temperament can have."

Napoli coach Gennaro Gattuso felt his side had missed an opportunity to give themselves more of a foothold in the tie.

"Barcelona struggled because we were very careful. We did well as a team to play together like this," he said, as reported by UEFA media.

"I am disappointed because we made one mistake and they made the most of it.

"We suffered tonight, tactically we were almost perfect, but we could have done better and been more clinical."

Gattuso, though, will take a positive mindset to Spain.

"Our dream at the Camp Nou is to play further up the pitch," he said.

"It's not over – it will be difficult, but we'll go there and try to progress."