Forbes made the comments following Morton’s 4-0 defeat to Rangers at home in the Scottish Championship on Sunday afternoon.
Although Jim Duffy’s side had chances at Cappielow Park, the Gers were too strong and maintained their 100% record in the league.
As things stand, Mark Warburton’s side are at the top of Scottish Championship table at the moment with 24 points from eight matches, nine points ahead of second-place Falkirk, who have a game in hand.
Former Dunfermline Athletic midfielder Forbes was impressed with Rangers, and has suggested that the Glasgow outfit are good enough to challenge rivals Celtic for the Premiership title.
“I think Rangers would more than hold their own in the Premiership,” the 26-year-old told The Glasgow Evening Times.
“They are far superior and cup games are a one-off. Over the course of a league season they’d definitely be up there challenging.”
It is quite bold of Forbes to suggest that Rangers are good enough to challenge Celtic for the Scottish Premiership title, especially as the Gers lost 3-1 to top-flight outfit St Johnstone at Ibrox in the third round of the Scottish League Cup last week.
One will know soon enough if Rangers are capable of giving bitter rivals Celtic a run for their money, as the Gers should be able to get promoted to the Premiership at the end of the season.