Man United and Man City lock horns over Jerome Boateng's signature

Bayern Munich defender Jerome Boateng has emerged as a summer transfer target for Manchester United and Manchester City, according to reports in the UK.

Boateng was sold by City to Bayern seven years ago, but his return has been requested by coach Pep Guardiola, who worked with him at the Allianz Arena.

During an injury-hit season with the Citizens, Boateng was restricted to just 16 Premier League appearances during his sole campaign with City.

He quickly fell out of favour with boss Roberto Mancini and returned to his homeland to improve his international prospects with Germany.

According to reports in the UK tabloids, the 29-year-old could be command a transfer fee of £50 million this summer.

However, the red half of the city, United are also interested in signing the German international.

United manager Jose Mourinho is rumoured to be keen on replacing Chris Smalling with the German international.