Cristiano Ronaldo's future creates uncertainty for Manchester United's 'obvious' transfer mission

In the few months that Ralf Rangnick has had his feet under his desk at Old Trafford, the Manchester United interim manager has not been afraid to highlight and draw attention to key problems.

From his maiden press conference, when he immediately highlighted United's need for greater control in matches, to when he called out Anthony Martial for refusing to travel to Villa Park for the Premier League clash with Aston Villa, Rangnick has not been afraid to voice his opinions. But it can only be considered as a good thing as it has shown that a United employee has not been afraid to voice a few home truths about where mistakes have been made.

Another problem that Rangnick has drawn attention to, although it does not take a rocket scientist to realise it, is that United's centre-forward options are not getting any younger. Between them, Cristiano Ronaldo and Edinson Cavani have a combined age of 72-years-old.

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Whilst they have both enjoyed long, lucrative and decorative careers, especially the former, they are now in the twilight years of their careers. Cavani, who has barely played this season, racking up just 17 appearances in all competitions, is set to leave United upon the expiry of his contract in June and uncertainty surrounds Ronaldo's future at the club, especially after United's Champions League exit to Atletico Madrid on Tuesday evening.

But whatever happens with Ronaldo's future this summer, the club needs to bring in a new striker. United, many moons ago, highlighted the need to bring in a younger option and it was something that Rangnick agreed with last month.

Asked if United need to bring in a