Lampard, Chelsea’s all-time leading scorer, will be integral to Jose Mourinho’s plan.
Robben told the People: “It is no surprise to me that Frank is now staying.
“It can not be for football reasons that he was going – because he is still one of the best – it must have been a personal thing with the old coach.
“As soon as it became clear Jose would return, there was never any chance Frank would go because there is such respect and friendship between the two of them.
“He sent me a text after we won the final – that is the sort of classy guy Frank is.”