Bayern Munich commercial manager Uli Hoeness says Germany striker Lukas Podolski has not done enough in Munich since his arrival in July 2006.
He said having a powerful shot was not enough and that it was too easy for defenders to take the ball from Podolski, who has scored four goals in 22 Bundesliga matches.
'He's been here nearly a year and a half, and he's got to show something in his second year, he's got to prove himself,' Hoeness told Sueddeutsche Zeitung.
'He hasn't done anything yet. If he doesn't make big changes in his attitude soon, he won't make it here.'