Antoine Griezmann revealed he is lacking confidence with decision making, while the Barcelona star said the relationship between himself and Lionel Messi is improving.

Griezmann has struggled to convince since arriving from LaLiga rivals Atletico Madrid in a €120million transfer at the start of the season.

The France international has scored four LaLiga goals and supplied three assists for Barca, however, his performances have been underwhelming.

Ahead of Wednesday's Champions League clash against Borussia Dortmund, Griezmann told UEFA.com: "I'm in the process of learning and understanding how my team-mates play as everything is new to me.

"I'm still trying to read the runs and off the ball movement from the likes of Luis Suarez, Leo Messi and Ousmane Dembele along with the midfielders. It's my intention to get to grips with this as soon as possible so I can offer my all to the team but at times it's tricky.

"At present when I get the ball I have a certain lack of confidence in when to pass or when to shoot on goal, this I'm sure is something that will change with the passing of time."

Much has been made about the relationship between Griezmann and superstar Barca captain Messi.

Last month, Griezmann admitted to finding it "difficult" to connect with Messi as neither of them are naturally big talkers.

"I'm pretty shy and sometimes have problems talking to others," Griezmann said. "It's rare that I strike up a conversation. Luis [Suarez], Leo and myself have had meals together and the relationship can only improve over time."

On Messi, Griezmann added: "He's the type of player that we're not going to see again for at least 40 years and it's a joy to watch him in action. It really is a privilege to play alongside him."