Martins has recently been in Italy for treatment on a groin problem, but insists he will be ready to head back to Tyneside in time for pre-season.
He added: "I have been in Italy for treatment lately.
"There I spoke to a lot of people about Juventus and their demotion to Serie B (in 2006).
"Back then, they still kept very, very good players such as Pavel Nedved, Alessandro Del Piero and Gianluigi Buffon. That helped them get promoted, so I can take a lot of solace from that."