Redknapp is a confirmed admirer of the duo, but he has hinted QPR will not spend big in the transfer window if they do not appear to have a realistic chance of staying in the Premier League.
"Darren Bent's a good player. They paid 20-odd million for him but I'm not even looking at January," said Redknapp.
"I've always liked Joe. I signed him for West Ham at 11 years old so no-one knows more about him than me.
"I still think he's got talent and there's a top player there, but I've made no enquiry about Joe. I've had no contact with his agent or anyone."