Everton boss Roberto Martinez is determined to get to the bottom of James McCarthy's hamstring issues.
The midfielder returned from a short spell out with a hamstring problem (missing Ireland's crucial Euro 2016 qualifier against Scotland) last weekend but limped off after only half an hour of Thursday's Europa League clash against Wolfsburg.
It seems highly unlikely he will feature in Sunday's match against Tottenham at White Hart Lane but Martinez insisted he did not regret playing the midfielder in Germany.
The Toffees boss said: "We're going to get him checked today. The reaction was good from last night but we'll find out exactly what the extent is.
"It's the hamstring that he had a bit of trouble with beforehand and we need to assess it with a lot of intention. It's a serious problem because it's a problem he's had before and we need to make sure we find the root of the problem.
"I would have had regrets if the injury had happened in the 80th minute, because clearly then it's because the tissues were fatigued and you're running a bigger risk.
"Football is a contact sport and you always run the risk of injuries. Yesterday was different. It was after 10/15 minutes, the soft tissues should have been in good condition."
"The reason that he's been affected with these sort of injuries is because of the amount of games he's been playing," said Martinez.
"He's a young man and he's played a huge amount of games, I think it's over 160 Premier League fixtures already, which is an incredible figure.
"His body is getting used to the demands of playing European football and international football and the domestic competition, so we need to make sure we find the right balance.
"That could go as far as nutrition, making sure the balance between rest and playing is right, and we're going to help him in that respect.
Full-back Leighton Baines and striker Steven Naismith have also had hamstring issues while Gareth Barry has been sidelined by an ankle problem and Steven Pienaar a knee issue.
Martinez is still set to be without Darron Gibson, Bryan Oviedo, John Stones and Antolin Alcaraz but striker Arouna Kone is finally fully fit.