Sir Alex Ferguson has reportedly told Jose Mourinho that Javier Hernandez is not for sale.
Real Madrid have been linked with a bid for the 23-year-old after he scored an impressive 20 times in his debut season with United.
According to the Daily Mail, Ferguson has "instructed the board to dismiss any offer" for Chicharito, who is likely to receive a significant boost on his £40,000-a-week salary from 2010/11.
The newspaper also claims that Ferguson is interested in 18-year-old Mexican striker Erick Torres from Chicharito's former club Chiva.