But Wayne Rooney and Joe Hart showed that once the Premier League season is over, all football rivalries are put to one side.
Manchester United's Rooney, and City's goalkeeper Hart, were snapped larking about on the beach together as they enjoyed a break in Barbados.
Rivalries aside: Manchester City's Joe Hart shares a laugh with United's Wayne Rooney as he gives him a piggyback on the beach in Barbados
They couldn't stop laughing as Hart, 24, gave Rooney, 25, a piggyback into the ocean, as the United striker jokingly tried not to get his feet wet.
The pair were then seen kicking a ball around on the sand, as the got in some practice for next season.
Get the ball! Rooney laughs out loud as Joe struggles to wade through the water to their football
To me, son! Back on the sand, Rooney and Hart are joined by a friend for a kick-about
They larked about on the beach by the exclusive Sandy Lane resort, where Hart and his long-term girlfriend Kimberley Crew are staying.
They were joined on the sun loungers by Rooney, his wife Coleen, 25, and their 18-month-old son Kai, who are staying at their ?5million villa on the island but who enjoy spending their days at the hotel too.
Hart and Rooney carried on their bonding with a dip on the ocean after getting too hot in the Caribbean sun.
Cooling off: Rooney, protecting his new hair transplant under a cap, chats with Hart as they take a dip in the ocean
Both men were making the most of their summer break before the season begins in August, but both had a lot of reasons to smile after their successes last season.
Although Rooney's United were beaten by Barcelona in the Champion's League final, they won the Premier League.
AndManchester City not only won the coveted FA Cup, but also managed to finish third in the league, securing them a place in next season's Champions' League.
Day on the beach: Hart and his girlfriend Kimberley Crew soaked up the sun on their loungers on the beach and were joined by Wayne and Coleen
Rooney and Coleen have been holidaying on the island for the last ten days and are due back in the UK next week.
And Rooney and Hart are not the only ones enjoying the Caribbean sun - Everton captain Phil Neville is also holidaying on the island with his family.
The 34-year-old and his wife Julie, along with their two children, Isabella and Harvey, were snapped relaxing in the sun aboard a diving platform.
Lazy day: Everton's Phil Neville and wife Julie relaxed on a diving platform as their children Isabella and Harvey prepared to go for a swim
?Explore more:People: Phil Neville, Joe Hart, Wayne Rooney Places: Barcelona, United Kingdom, Barbados, Caribbean
Source: Daily Mail
Source: Daily Mail