Leigh Griffiths to bust a gut back in Glasgow to get himself back in the frame at Celtic.The Hoops striker has been left at Lennoxtown to work on his fitness while the rest of the squad ramp up their pre-season preparations in France this week.Neil Lennon’s men take on Nice before squaring up with Moussa Dembele’s Lyon at the weekend and PSG in Paris on Tuesday.Griffiths felt the wrath of his manager for failing to hit his targets after coming back after lockdown and Brown also told his Parkhead pal to get to work.The skipper reckons Griff can still be a key man in the quest for 10-in-a-row – but he has to get back firing quickly.Brown said: “Everyone that’s here has worked extremely hard on their fitness and he needs to make sure he does.
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