QPR are set to sign Tal Ben Haim.
The Israeli defender has been without a club since leaving Pompey in August and has been training with the Rs since the start of December.
"Tal has worked hard [in training] and we will look to give him a contract until the end of the season," said Redknapp after his side won 1-0 at Chelsea on Wednesday night.
"He may be added to the squad. He is keen to have a go with us."