Lehmann went onto state that every player can and should be working on their game until the day they retire.
“He can definitely do that but now he must prove it. You need to know how to think and how to programme yourself,” Lehmann told The Sun (via Mirror).
“Of course he can improve. You can’t get better on the day that you retire from football – but you can every day before that.”
Özil ended the 2014-15 season with his second consecutive FA Cup title. The Germany international joined Arsenal for a club record £42.5 million from Real Madrid back in 2013.
The Arsenal playmaker provided nine assists and five goals in 32 appearances this season. Özil has the third best minutes per assist rate in Premier League history. The 26-year-old ended the 2014-15 season with his second consecutive FA Cup title.
Arsenal finished the season in third place and will directly qualify to the UEFA Champions League group stages next season.