Celtic have secured their fifth successive Scottish Premiership title this season.
The Hoops secured their fifth successive Scottish Premiership title this year as they held off the challenge of Aberdeen.
They are set for major change this summer though, as manager Ronny Deila will depart the club after a disappointing two-year spell in charge.
The new manager faces a sterner fight for the title than the Norwegian, with old rivals Rangers returning to the top flight and keen to make an instant challenge at the top.
And Griffiths, who has managed 31 goals in total in the league, has admitted they will have to raise their game next season.
“Hopefully with the new manager coming in, we will strengthen as well and we’ll look to go and make it six,” he told celticfc.net.
“We’ve proved that we have the best squad in the league. We are going to have to raise our game again next season, but that’s all down to the management team and who we bring in.”
Next season does promise to be an interesting one for Celtic next season as Rangers return to the top flight.
Mark Warburton’s side have impressed this season and showed that they could be ready to compete when beating Celtic in the Scottish Cup semi final.
The transfer window is sure to be key, with the Gers keen to improve and the new Celtic manager very likely to want to mould the squad he inherits too.