Real Madrid continue to chase Champions League glory this season and are looking a safe bet for a runners-up spot in La Liga, but the biggest challenge might yet be ahead of them—keeping star forward Cristiano Ronaldo at the club.
The Portuguese attacker has been continually linked with a move away, most often back to former club Manchester United (via The Independent), but his astronomical transfer market value is cited as a determining factor in putting clubs off.
Even if Ronaldo does not move on this summer, with just two years left on his contract it is likely that Real will allow him to leave within the next 18 months to avoid losing their biggest asset for free.
Whenever he departs he will leave a gaping hole in the team's attack, meaning Real Madrid will have to work hard to bring in someone of adequate quality to replace him in the side. Here are five such names who could be the front-runners to fill Ronaldo's boots in Real Madrid's attack.