Claudio Ranieri insisted Jamie Vardy will be ready for Euro 2016 - despite not knowing when the Leicester striker was last fully fit.
The boss has revealed Sheffield-born England forward Vardy had not trained for the last month as he battled a groin injury - which eventually needed surgery earlier in January.
He has also played with an ankle injury and broken wrist this season but is the Barclays Premier League's 15-goal joint top scorer.
Vardy returned to play after 71 minutes of Leicester's 1-0 win at Tottenham on Wednesday and Ranieri expects him to be fine for England's European Championship campaign in the summer.
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He said: "He should be fit when he arrives there, slowly he will get better.
"That doesn't mean getting better means he will score more goals but he will feel better.
"It difficult to say (when he was last fit), it's important he continues to play. If he doesn't train very well it's important he keeps going to play. The match is like a training session for him.
"Jamie will start to make training sessions with us, he's getting better. It's important, it'll (be) 'yes or no' as to how I manage him.
"It'll depend on the match and if I see he's a little tired. I prefer to manage him during the training session. The important players must play every time and get some rest during the week."
England face Russia, Wales and Slovakia in France with Vardy having forced his way into Roy Hodgson's squad last year.