The Villains are desperate to tie the burly Dutchman down to a new contract as his deal nears its final six months, yet negotiations are on-going.
‘Concrete Ron’ is rumoured to be aware that his stock is at an all-time high following his impressive World Cup performance, with both Arsenal and United interested.
Villa are conscious that they may be unable to keep Vlaar, which has prompted fresh interest in long-term target Rolando.
The 29-year-old is also set to be a free agent at the end of the season, and the Portuguese giants are reluctant to see him leave for nothing, opening the door for a cut-price winter move.
Rolando spent last season on loan at Inter Milan and is rumoured to be eyeing a move back to Serie A.
However, the lure of Premier League football and potentially high wages may sway him.
West Brom, Everton and Sunderland have also been linked with the Portugal international.