Rangers sweat over fitness of two defenders prior to Celtic clash
The pair were both substituted during the second half of Rangers’ 3-1 extra-time Betfred Cup quarter-final victory over Partick Thistle.
Alves felt a problem with his calf, while left-back John, already filling in for the injured Lee Wallace, had an issue with his thigh.
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Hide AdManager Pedro Caixinha says both players will be assessed in the coming days before a decision is made about their availability.
He said: “When we were controlling the second half I had to take Bruno and Declan off at the same time.
“Both have problems and that is the reason I was forced to make the substitutions.
“We know we have four days so we need to assess them over the next 24 to 48 hours and see whether we have a clearer idea if they can make it.
“I need to know before I can make my decision for Saturday. “