El Chiringuito says Mahrez's agent has offered his player to Barça, alleging that City boss Pep Guardiola wants to sign Tottenham striker Harry Kane and Aston Villa's Jack Grealish.
Barça and Manchester City could do numerous deals this summer. Sergi Roberto's name is on the table to go the other way, while defender Aymeric Laporte has been linked with Barça. This comes after Barça have already announced deals to sign Sergio Aguero and Eric Garcia on free transfers.
However, Mahrez and Gundogan are not available for free and both would command a fee -- or a player exchange.