Alaba impressing Bayern boss Heynckes

Brief news ahead of this weekend's Bundesliga matches:

Austrian teenager David Alaba has the potential to become an outstanding midfielder although he is currently playing at left-back for Bayern Munich, according to coach Jupp Heynckes.

The 19-year-old has become a regular for his club and at international level this season and Heynckes said he had had to tell the Austrian to take it easy.

"David is burning, he has so much ambition," Heynckes told Bayern's website, adding that he saw a similarity between Alaba and former West Germany player Guenter Netzer.

"One needs a lot of experience to play consistently well in midfield at the highest level," added Heynckes.

Second-placed Bayern, who have scored seven goals in each of their last two games, visit Hertha Berlin, who have managed only one goal in their last seven outings and are in 16th, the relegation play-off spot.

Leaders Borussia Dortmund's impressive run is little consolation for Croatia forward Ivan Perisic who has found himself repeatedly on the bench.

"I came here to play, not to sit on the bench," Perisic, in the queue behind Mario Gotze, Kevin Grosskreutz and Jakob Blaszczykowski for a regular place, told Kicker.

"When I see how we win as I sit on the bench, it kills me. I do not want to wait until someone is injured to play. I just want to play. And if not at Borussia, then at another club."

Dortmund, five points clear of Bayern at the top, are at home to Werder Bremen on Saturday.

Bayer Leverkusen midfielder Lars Bender could be out for several weeks after tearing a thigh muscle, the club said on their website.

The 22-year-old, who has four caps for Germany, sustained the injury during last week's 3-2 defeat by VfL Wolfsburg.

Fifth-placed Leverkusen face local rivals Borussia Monchengladbach on Saturday. Gladbach are third with 48 points, having taken only one point and failed to score in their last two outings.

Hamburg SV cannot possibly be relegated as long as Thorsten Fink is in charge, according to former Bayern Munich and Borussia Dortmund coach Ottmar Hitzfeld.

"I guarantee it, as long as Fink is coach of Hamburg, they will not be relegated," Hitzfeld, who has won a total of seven Bundesliga titles in stints with Borussia Dortmund and Bayern Munich, told Bild newspaper.

"In spite of the many injuries and suspensions, I believe they will win," he added ahead of Hamburg's relegation battle with Freiburg on Saturday.

Hamburg have slipped to 14th in the 18-team table after a run of poor results under former FC Basel coach Fink. They have 27 points while Freiburg are 17th, in the relegation zone, with 22.