Lydiate, who was voted player of the tournament in last year's competition, suffered the problem in September and as a result missed the autumn internationals.
The Newport Gwent Dragons man is expected to be selected for the Lions in the summer and is understandably keen to make sure he doesn't rush back as it could jeopardise his place on the tour.
The 25-year-old has had a string of ankle injuries throughout his career and says after his previous mistakes, he will not be forced to return before he feels ready.
"It all depends on how it goes over the next few weeks but I have not got a specific date," he told the Western Mail. "I had the screws taken out before Christmas and that helped a lot, it's coming on quite well. I desperately want to play but you don't want to take the field if you aren't right.
"It all depends on me. I'm not being forced to come back on a certain date. I have got to be careful."