Wolfsburg have hit playmaker Diego with a huge fine of €500,000 for storming out on the side at the end of last season, according to reports from Bild.
The Brazilian international reportedly left the team hotel and missed his side's 3-1 victory over Hoffenheim on the last day of the recent season.
Diego's behaviour is believed to be caused by coach Felix Magath's decision to drop the former Juventus man to the bench on May 14.
The record fine totals to a month's wages for the 26-year-old who is expected to join up with his team-mates on Friday where the club will begin their preparations for next season.
This is the second time Diego has been in trouble with the club, after going against former coach Steve McClaren's orders in February when he took a penalty against Hannover, which was missed.
The attacker, who has 34 caps for the Brazilian national side has endured a poor debut season for Wolfsburg since his €15 million transfer from Juventus last summer.
Diego's future at the club looks uncertain despite scoring six Bundesliga goals last campaign in 30 appearances.