Riyadh - Saudi officials are in 'difficult' talks to keep Cristiano Ronaldo in the country, a source with knowledge of the negotiations said Thursday, after the star player suggested he was leaving Al Nassr.The Portuguese superstar, whose arrival in 2023 heralded a rush of late-career players to the oil-rich country, could transfer to Al Hilal and feature in the upcoming Club World Club, the source said.'There is an ongoing difficult negotiation to convince Ronaldo to stay and play' in the Saudi Pro League next season, said the source from the Public Investment Fund (PIF), a major investor in Saudi soccer.