The 70-year-old will take charge of pre-season after having a tumour removed from his bladder
Tests later showed that the tumour was not malignant, but Redknapp will have further check-ups every three months.
Redknapp took charge of the Championship club in April after Gianfranco Zola resigned, and succeeded in saving them from relegation.
“They cut it out, took it away, sent it away to make sure it is not malignant and luckily everything was OK. I know I am fortunate,” Redknapp said.
“They cut it out, there was no other option. Once they did that I was up and about after a couple of days. I am relaxed about it now because what can you do?”