BERLIN, Oct 1 (Reuters) - Bayern Munich captain Oliver Kahn is to have surgery on his elbow that will rule him out for at least four weeks, coach Ottmar Hitzfeld said on Monday. The 38-year-old aggravated an existing injury while warming up before Saturday's match against Bayer Leverkusen and was replaced by Michael Rensing, his designated successor. 'He'll be out for four to five weeks,' Hitzfeld told reporters in Munich. 'The operation will be done as soon as possible.' Rensing, one of Germany's top goalkeepers who has only played occasionally at Bayern, had an outstanding match against Leverkusen. Bayern won 1-0.
Bayern Munich's #1 goalkeeper Oliver Kahn striker Miroslav Klose have been ruled out of Thursday's UEFA Cup 1st Round 2nd Leg match against Portugal's Belenenses. Lukas Podolski has been ruled available after an injury scare. Kahn and Klose join Philipp Lahm, Willy Sagnol, José Ernesto Sosa and Valérien Ismael.

Oliver Kahn will require elbow surgery and will be out for five weeks.

Bastian Schweinsteiger, Marcell Jansen and Luca Toni didn't practice today for precautionary reasons.

Michael Rensing will replace Oliver Kahn in net while it's not known what formation Ottmar Hitzfeld will use on Thursday.