Lionel Messi and Cristiano Ronaldo may be taking a break from football in La Liga with Barcelona and Real Madrid, but the planet's two top players renew rivalries at international level on Tuesday as Argentina face Portugal at Old Trafford. Ronaldo's return to Manchester sees him back at the stage where he shone for five and a half years, while Messi will be reunited with the United fans he upset with match-winning performances in the 2009 and 2011 Champions League finals.
