The 29-year-old is among those players being monitored though the Spanish club, who rejected a £25million bid from Newcastle in January for the Brazilian, are expected to demand a hefty fee.
Burnley defender James Tarkowski remains high on Villa’s list of targets and could make a decision on his future in the coming days. The 29-year-old is set to become a free agent at the end of next month and has also attracted interest from Everton.
Villa have scouted Rangers’ Calvin Bassey as they eye potential options at left-back should Newcastle trigger their option to sign Matt Targett on a permanent deal.
Midfielder Douglas Luiz, who has just 12 months remaining on his contract, has been linked with Roma.