Manager Tim Sherwood could attempt to reunite with the former Tottenham Hotspur defender should Ron Vlaar leave Villa Park in the summer.
Vlaar is out of contract at the end of the season but talks over an extension have been put off as Villa look to secure Premier League survival with four matches remaining.
Speaking to the Birmingham Mail this week, manager Tim Sherwood stressed that he is eager to tie the Dutchman down to a new deal but knows that there will be a great deal of interest in his signature.
Vlaar himself has hinted that he would be open to prolonging his Villa career, telling the Telegraph that “things have changed” for him since Sherwood’s appointment, but, with a month now left of the campaign, his future remains up in the air.
That has prompted the club to look to potential replacements, with the Telegraph suggesting that Caulker is at the top their list.
The one-time England international was on Tottenham Hotspur’s books during Sherwood’s time as the team’s development director, making 28 total appearances during the 2012-13 season before leaving for Cardiff for a club-record fee in excess of £8 million.
He was an ever-present for the Welsh side in the top-flight last term but was unable to prevent them from suffering relegation and made a summer switch to QPR, where he has since featured 33 times.
Aged 23, the former Spurs trainee would prove an excellent addition for a number of Premier League teams but, with the Hoops still in with an outside shot of avoiding the drop, there is a chance he might not be available on the market.
In addition, it’s debatable how much of a wise investment he would prove for Villa, even if Vlaar were to leave.
Ciaran Clark, Jores Okore and Nathan Baker have all performed well this season, while Philippe Senderos also impressed over the first few months of the term until being ruled out in November with a long-term calf problem.
With loanee Janoi Donacien set to return in the summer too, there would seem to be enough centre-back cover to allow Sherwood to spend his transfer funds on other more desperate areas, such as full-back and attack.