Bundesliga leaders Borussia Dortmund have confirmed teenage striker Alexander Isak has joined Willem II on loan until the end of the season.

Dortmund snapped up Isak – who was compared to Zlatan Ibrahimovic during his time with AIK in Sweden – 12 months ago, but first-team opportunities have been limited.

Isak has only featured five times in the Bundesliga and has yet to make a matchday squad under Lucien Favre this season.

Dortmund still have high hopes for Isak – who has scored five goals in 11 games for the second team in 2018-19 – and believe a spell in the Netherlands will aid his development.

"We want to give Alex, whom we believe to be great talent, the opportunity to gain a high level of match practice," sporting director Michael Zorc told the club's website.

"That's exactly what we wish for at Willem II."

Isak scored twice in a recent friendly match against Willem II during Dortmund's mid-season break, and technical director Joris Mathijsen hopes he can provide a much-needed goal threat for the side sitting ninth in the Eredivisie.

"We had been thinking of Alexander for a long time," said the former Netherlands international.

"It was a coincidence that we could see him in action against us during the training camp.

"Alexander is a big and strong boy, therefore a focal point in the attack but also very goal-oriented."