The Shakhtar boss does not think the winger is good enough to force his way into Bayern's starting XI yet - though he is confident in his potential

Douglas Costa is not yet ready to displace Franck Ribery and Arjen Robben at Bayern Munich, according to Mircea Lucescu, the Brazilian's former coach at Shakhtar Donetsk.

Bayern signed the 24-year-old for €30 million to bolster their options in attack after Robben and Ribery's injury-hit seasons contributed to Bayern's defeats in the Champions League and DFB-Pokal semi-finals.

But though Lucescu believes Costa has the potential to eventually become a game-changer for die Roten, he nevertheless maintains his protege is not yet of the calibre to fill Ribery or Robben's boots.

"I don't think Douglas is good enough to start for Bayern yet," the 69-year-old told Bild.

"Ribery and Robben are still on a different plain. But Douglas is can grow further there and still make it.

"He has the quality, but the Bundesliga is at a different level [compared to the Ukrainian Premier League]."

Costa moved to Donbass Arena from Gremio in 2010 and had gone on to score 38 goals in 202 appearances in all competitions before his transfer last Wednesday.

The Brazil international is Pep Guardiola's third signing this summer following the arrivals of goalkeeper Sven Ulreich as well as ex-Red Bull Leipzig loanee and Stuttgart talent Joshua Kimmich.

addResponsivePlayer('1wn75vfostk4e1313yu1kkgfaz', '90c3f911c1684c4f96b53843751b4bb7', 'jt2djj6xo56r177duygsg2iei', 'perf1wn75vfostk4e1313yu1kkgfaz-jt2djj6xo56r177duygsg2iei', 'eplayer40', {age:1429631048000});