The 19-year-old is one of the most sought-after strikers in Europe after shinning for Salzburg - where he scored 28 goals in 22 matches this season.
Marco Reus has heaped praise on his new Borussia Dortmund team-mate Erling Braut Haaland.
The Germany international believes Haaland has the attributes to become a world class striker like Robert Lewandowski.
The 19-year-old is one of the most sought-after strikers in Europe after shinning for Red Bull Salzburg - where he scored 28 goals in 22 matches this season.
Premier League giants Manchester United, Serie A champions Juventus and RB Leipzig were among the clubs said to be interested in the 19-year-old before Die Borussen eventually sealed his services for a reported fee of €20million.
"He's very open-minded and it's important to get to know everyone first - a training camp like this is ideal," Reus told Sky Deutschland.
"Now it's about getting really fit, arriving properly. It will take time, we'll give it to him. He just gives us another input, another way we can play.
"I don't think we have had this type of player since Lewy [Lewandowski]. He gives us the opportunity to be more flexible and able to react to different scores.
"It makes us feel good. Now he has to get well and get to know everyone properly - we have to, too. We have to go with him and his strengths, but that will all happen over time.
"Paco [Alcacer] really boomed at the beginning, then he was injured longer. Then the coach decided differently.
"As I said, Haaland gives us many opportunities to play football, but ultimately the coach has to decide who will be used.
"For me and other players, we have new options with Haaland, sometimes long balls. In football it's important to be flexible and we have achieved that.
"We have now got a very good striker and with it new options, so we're well positioned."