Senderos joined Rangers in the summer of 2016 on a free transfer on a one-year contract when Mark Warburton, now at Nottingham Forest, was in charge.
The 32-year-old former Arsenal and Aston Villa centre-back was expected to add experience and leadership to the Gers, but he has been a failure.
Injuries have played their part, but when Senderos has featured, he has not been very impressive. The former Arsenal defender has been able to make only four starts so far this season for Rangers.
Former Rangers star Johnstone believes that Senderos will not be at Ibrox for the 2017-18 campaign.
“I can’t help thinking that unless he knows something we don’t, Philippe Senderos, after last Saturday, must realise that he won’t be a Rangers player after this summer,” Johnstone wrote in The Glasgow Evening Times.
“I don’t think that comes as a shock to anyone; his stay in Glasgow has been doomed from the off, ever since being pitched in at the deep end in the Old Firm game which ended in a 5-1 loss and a red card.
“After that, it was going to take something special to find a way back. And he just didn’t have it.”
According to a recent report in The Daily Record, Switzerland international defender Senderos could leave Rangers in the summer transfer window and return to his former club Grasshoppers to become their sporting director.
Rangers are third in the Scottish Premiership table at the moment with 52 points from 31 matches.