Celtic have been back in pre-season training for over a week now.
Glasgow Rangers goalkeeper Matt Gilks has played with Ibrox teammate Kenny Miller and West Bromwich Albion midfielder Darren Fletcher for Scotland.
Mane is close to completing his move to Liverpool.
Brendan Rodgers is anxious to have a full group of players to choose from once the Scottish Premiership commences.
Tottenham Hotspur have been linked with the AS Roma forward but he is not worth too much.
The former Gunners midfielder was far from impressive as Spain crashed out of Euro 2016.
The 33-year-old decided to join Mark Warburton's Glasgow Rangers side.
The Belgian striker has been linked with a host of clubs across Europe this summer.
Marseille are planning a swoop for Bafetimbi Gomis as a replacement Michy Batshuayi.
Tottenham Hotspur midfielder Dele Alli struggled to make an impact for England at Euro 2016.