The Villa Park duo are both entering the final six months of their respective contracts with the Midlands side, and neither have yet made any major suggestions that they’re ready to commit to the club.
Manager Paul Lambert has revealed that he has no plans to cash onto the pair, but losing them both for free would represent terrible business for the Claret and Blues, which has alerted Liverpool chief Brendan Rodgers.
The Northern Irishman is thought to have set his sights on a new centre-back and a deep-lying midfielder in a bid to get his side’s ailing season back on track, with Vlaar and Delph genuine options.
The latter is seen as his favoured target, with the central star having enjoyed a great start to the current campaign.
Delph, 25, has forced his way into the England set-up, and is seen as a potential long-term replacement for ageing skipper Steven Gerrard.
Vlaar is also on Liverpool’s radar, with Rodgers ready to add a commanding centre-back to his ranks.
The Reds have been woeful defensively this term, as newbie Dejan Lovren has struggled to adapt to life at Anfield.
Vlaar’s stock is at an all-time high after a stunning World Cup with the Netherlands, and he’s thought to be eyeing one last big move at the age of 29.