Struggling German giants Borussia Dortmund on Monday announced that they have agreed a deal to sign Slovenian international midfielder Kevin Kampl from Austrian champions Salzburg.

Dortmund said that Kampl, 24, will sign a long-term contract to keep him at the club until 2019.

"Kevin Kampl is a versatile attacking midfielder, who we have been observing for some time. His style of play fits in perfectly with our own," Dortmund sporting director Michael Zorc told the club website.

Borussia said that "both clubs agreed details of the transfer fee shall remain undisclosed", although the website of German magazine Kicker reported the fee would be in the region of 10 to 12 million euros (£7.8m-9.4m, $12.2m-14.7m).

Kampl, who will join his new club in January, was born in Germany but represents Slovenia at international level.

He started his career at Bayer Leverkusen and played for several lower-league clubs in Germany before moving to Salzburg in 2012.

News of Kampl's arrival comes as a boost to Dortmund, who are through to the last 16 of the Champions League but lie in the relegation zone in the Bundesliga at the season's halfway stage.

Their next game, against Leverkusen, is not until January 31.