The Reds are set to finalise a transfer for Sunderland youngster Jordan Henderson but the mooted £20million (£16m plus David Ngog) has attracted some criticism from outsiders who feel the Black Cats starlet may not be worth the money.
But Redknapp knows Dalglish very well and says that the Scot would not be paying a big fee if Henderson was no good.
"I'm sure Kenny's [Dalglish] had his eye on him for a while and he's a shrewd judge," Redknapp told talkSPORT.
"He's [Henderson] a good young player.
"If he thinks he's worth the money then I wouldn't want to argue with him."