The Honduras international was on the end of a thumping body check from Tony Hibbert, which earned a stoppage-time penalty.
After a lengthy break in play, Palacios was stretchered off with an apparent head injury and Redknapp hopes that one of the key members of his midfield has not sustained a serious problem.
The Spurs said, “They have taken him to hospital and he is in a lot of pain. He is a tough lad so it can’t be very good for him to be struggling like he is. Hopefully he will be okay.”