Skipper Scott Brown sent out a warning to Rangers by claiming Celtic have improved since their comprehensive 5-1 victory at Ibrox.

Brendan Rodgers' side went unbeaten on their way to the domestic treble last season and knocked the Light Blues out of both major cup competitions at the semi-final stage.

Rangers took just one point from four Ladbrokes Premiership games with Celtic and were on the end of two 5-1 thrashings, the latest at Ibrox in April.

Read more: Brendan Rodgers: I'm not at Celtic for my CV, I'm here because I love the club

Celtic have since extended their unbeaten run against Scottish clubs to 56 games ahead of the first Old Firm game of the season on Saturday lunchtime.

Asked if the Parkhead side were better than the last time they visited Govan, the Scotland captain said: "Yeah, we are stronger, we are fitter and more together as well.

"We have a few different formations that we can chop and change during the game.

"It is always based on what the gaffer has been doing in training since the start of the season."