Germany and Bundesliga icon Rudi Völler believes Robert Lewandowski remaining at Bayern Munich could cause problems if the champions continue to refuse to sell him. The Poland striker has expressed his wish to leave the club after eight remarkable seasons where he has won the league title in every campaign. Barcelona want to sign the 33-year-old despite their money worries and Bayern appear to have found a part replacement for Lewandowski, with media reports saying Liverpool’s Sadio Mané is set to undergo a medical on Tuesday. There is still a chance that Lewandowski stays in Munich with one y…