Karl-Heinz Rummenigge is not concerned by the prospect of Robert Lewandowski being Bayern Munich's only recognised out-and-out striker for the remainder of the season.

Bayern sanctioned the sale of Sandro Wagner on Wednesday, just a year on from his arrival from Hoffenheim, after the Germany international received a lucrative offer from Chinese Super League side Tianjin Teda.

With Bayern trailing leaders Borussia Dortmund by six points in the Bundesliga table, and still competing in the DFB-Pokal and Champions League, the decision to sell without drafting in a replacement came as a surprise to some.

But Bayern chairman Rummenigge is confident the likes of Thomas Muller or Serge Gnabry could fill the void should something happen to Lewandowski.

"Sandro asked [to leave] because he had an offer from China with an incredibly high salary," Rummenigge told reporters.

"We discussed that with the coach and Niko Kovac thought that with Thomas Muller and Serge Gnabry, in case of doubt, we have alternatives.

"But Robert Lewandowski has never been injured at Bayern Munich since 2014."

Rummenigge also accepted Bayern face a tough task to hunt down a Dortmund side who have lost just once in the league this season.

"Borussia Dortmund are playing a very good and very stable season," he added. 

"Catching them up there again will be very difficult, but we will work to keep the tension at the top alive."

Forward Sandro Wagner has left Bayern Munich to join Chinese Super League side Tianjin Teda, the Bundesliga club have confirmed.

The 31-year-old joined Bayern from Hoffenheim in a €13million move in December 2017 and scored eight goals as they won the Bundesliga title last season.

However, Wagner, firmly second choice behind Robert Lewandowski, started just one league game this term and failed to find the net in the competition.

Wagner will now link up with Tianjin, where he has reportedly been offered a lucrative two-year deal following a €5m transfer.

He is set to join compatriot and former Hertha Berlin team-mate Felix Bastians, while German coach Uli Stielike is in charge at the Chinese club.

John Obi Mikel has joined Middlesbrough on a short-term deal, the Championship club have confirmed.

The 31-year-old has finalised his move to the Riverside Stadium after leaving Chinese side Tianjin Teda at the end of the Super League season in November.

Mikel is Boro's second signing this month, following the loan arrival of Rajiv van La Parra from Huddersfield Town.

The midfielder spent 11 years in England with Chelsea, winning two Premier League titles, three FA Cups, the EFL Cup, the Europa League and the Champions League.

The Nigeria international, who played at last year's World Cup, had been linked with moves to Ligue 1 and the Bundesliga, as well as Saudi Arabian side Al Nassr, before agreeing to sign for Boro.

Tony Pulis' side sit fifth in the Championship table after 28 matches, seven points behind leaders Leeds United.

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