He made his return to action off the bench against the Blues at the end of last month, before again featuring in the thumping 41-17 home defeat to Treviso.
But having got into the play-offs as a result of the Ospreys' defeat in Dublin, Priestland insists he will be fit and firing ahead of Friday's clash against Ulster, having been named in the starting line-up.
He said: "I thought this group would get into the play-offs and I targeted trying to get back before the end of the season and play some part in the play-offs.
"I've enjoyed the break, it's a part of rugby. I've taken it for what it is, but I'm fit now, fitter than I've been for a while, my body feels good apart from my Achilles which still feels a little stiff. I've really enjoyed coming back into the environment with the team.
"I had to hit some targets before coming back to play and a lot of those were fitness targets so it's been some of the best scores I've done down here. It's been nice to have a rest and the body is feeling the way it should do.
"I felt good before the injury happened, in the last two games of the autumn I felt really good and was looking forward to having a good Christmas with the Scarlets and making a push for the play-offs.
"Throughout my career I've been quite fortunate, this is my first serious injury. I've been carrying a lot of bumps and niggles over the last year or however long but it's a part of rugby and I've got to take the positives from it. I feel really fresh and my body feels good so all in all it's been a good rehabilitation period for me.
"The last two years we have finished fifth but always in the lead-up we were outsiders to get there and after the result against the Blues we were in the driving seat.
"So it was something a bit different for this group, it's not something we had experience before and I don't think we dealt with it particularly well. But a bit of the pressure is off now, we've got in there and it's just about turning up and making sure we put a good account of ourselves in this week."
While the Scarlets had been looking ominous leading into the play-offs, winning seven of their last eight games prior to last weekend, their momentum was slowed somewhat against Treviso.
Despite being on home soil Simon Easterby's side were second best in virtually every aspect of the game as the Italian side recorded their biggest-ever away victory.
Priestland admits the overriding feeling was one of embarrassment after the game, but has called on the team to pick themselves up quickly if they are to avoid a similar experience away in Belfast.
He added: "After the game everyone was disappointed, embarrassed at the way we performed. I don't think anyone could really understand where it had come from because things had been going so well.
"We'd lost something like one in ten and I think we turned up and expected it to happen. I don't think it was because we were playing against Treviso, it would have happened against whoever we were playing because we had been playing so well.
"As a group we really took our foot off the pedal and it was a big wake-up call for us because if we are anything like that at the weekend it's going to get embarrassing for us again so it could be a real wake-up call for us. Nobody wants that to happen in the semi-final."
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