Sergio Ramos
Sergio Ramos has been linked with a sensational move to Old Trafford Getty

Manchester United have demanded that Real Madrid include Sergio Ramos as part of the deal to sign David de Gea, failing which the Red Devils will block any move for the player this summer, according to the Daily Mirror.

Ramos is currently on his penultimate year in contract, which expires in 2017 and has a release clause in the range of £145m ($229m) to take him away from Madrid. However, United value the player at around £30m ($47m) and are willing to do a swap deal with De Gea, who is Madrid's priority signing this summer.

The 24-year-old will replace Iker Casillas, who has received a lot of flak from fans this season for his failure to influence games and is likely to leave the club. The keeper has only a year left in his current contract and has already told his teammates about his desire to switch clubs this summer.

Ramos, 29, still has years of first team football left in him and would add some much needed experience to United's backline which has not been replenished after the departure of Rio Ferdinand and Nemanja Vidic.

Ramos wants a pay rise on his current contract, which has not been accepted by Madrid, allowing United to look for a possible move for the Spanish veteran. Ramos has won everything there is to with both club and country and may look for a new challenge in the Premier League, where he will be well compensated for his services.

Ramos will reunite with former Madrid teammate Angel di Maria at Old Trafford along with Victor Valdes and Juan Mata from the national team.

Ed Woodward is searching for avenues to broker a deal for the player, but has quality back-ups in store should a deal fail to go through this summer. The 20-time Champions have been linked with Valencia centre-back Nicolas Otamendi and Borussia Dortmund stalwart Mats Hummels, who would all go a long way in strengthening their defence.