James McCarthy has admitted that he still has work to do to regain peak fitness after adjustments to his training routine facilitated his return to action for Everton.
The Irish international will be involved in tonight's Europa League encounter with Young Boys Berne as he takes the next step in his comeback following a campaign interrupted by hamstring issues.
McCarthy made a first appearance since December in the Merseyside derby 12 days ago but was then restricted to a substitute's role in the loss to Chelsea last week where he clashed with Branislav Ivanovic.
The Glaswegian expects Roberto Martinez to be careful in terms of how he manages him - and Ireland boss Martin O'Neill will be anxiously watching from afar with next month's showdown with Poland in mind.
"I've been looked after well," said McCarthy. "We've changed a few things in training and I'm delighted to be back involved.
"It was a frustrating time. I don't want to break down again. The gaffer will know what he's doing with me.
"He'll take it day by day and not get too carried away. I want to keep working hard and get back to the fitness I had when I broke down.
"It was always going to be a long recovery. I wanted to get back as soon as I could and it got delayed another couple of weeks and that is part and parcel of football."
McCarthy's Irish colleague Aiden McGeady is out of the Swiss encounter through injury.