Anderson claimed the PDC world titles in 2015 and 2016 but lost to Michael van Gerwen in the final when going for a third straight gong.
But the Scot is just two wins away from yet another final at Alexandra Palace, although it looked like he might be forced out without losing a match.
Anderson beat Steve West 4-2 in the third round but appeared to be struggling at the oche with a back problem.
The 47-year-old was left considering not taking to the stage against the 14-time PDC champion tonight but according to Sky Sports, he is now “good to go”.
Anderson has not spoken about the injury but pundit and former player Wayne Mardle believes he knows what the problem is.
“The way he was holding his leg it looked like something to do with the sciatic nerve,” Mardle said after the West match.
“My wife suffers from sciatica and she always says there is a pain kind of where Gary was holding himself.
“I hope not because it’s hard to concentrate when you’re in pain but towards the end he sped up and seemed to score better… I don’t know.”
Anderson will be afforded a little extra time to get his body into shape by the fact he is on second in tonight’s session.
First, defending champion Van Gerwen will take on fellow Dutchman Raymond van Barneveld in a mouthwatering encounter.
Following them, Anderson and Taylor will be meeting in a re-run of the 2015 final, when the Scot emerged a thrilling 7-6 victor.