"I'll be fine by Harlequins, I know that myself. It usually takes me three matches to get my fitness back and I've two-and-a-half played now," O'Connell said in the wake of his man of the match performance against Connacht at the weekend.
"It was great to get through the 80 minutes. I had a few good carries, but some of my breakdown stuff I wouldn't be too happy about and I will take a close look at that.
"But it is great to be back and I will feel better as a result of this one. The last few months I've been doing rehab on the weekends and watching games from the stands so it was great to be able to play."
The 22-0 home win over Connacht in the RaboDirect PRO12 was just the tonic Munster needed as they prepare to push for a fifth Heineken Cup final. With this season's final taking place at the home of Irish rugby, the Aviva Stadium in Dublin, there is extra incentive for the two-time winners to go all the way.
The Heineken Cup has been won by Irish provinces in four of the last five seasons and both Munster and Ulster are chasing the crowning glory of winning a European title on home soil.
But while O'Connell, who celebrated his return in a Munster jersey with his first try in four years, is focussing on the Heineken Cup, he hasn't let his mind wander to the possibility of making a third tour with the Lions.
Lions head coach Warren Gatland was delighted to see O'Connell return - he played in the last six Tests on the 2005 and 2009 tours - and will be closely monitoring his fitness and form in the Heineken Cup quarter-finals before naming his squad on 30 April.
"I'm not thinking about that - I'm just happy to be back playing for Munster. I want to play as well and for as long as I can for Munster and that's my sole focus," said O'Connell.