Harry Forrester appeared to be struggling with his stomach throughout the first half of the Scottish Championship game against Greenock Morton at Ibrox in Glasgow on Friday evening.
Warburton has revealed that there is a sickness bug, but he has assured the fans that it is not serious.
“There’s a bit of a sickness bug there, a couple of the boys felt a little bit ropey,” Warburton told Rangers’ official website. “Harry hoped he could play through it and it was obviously bothering him as you saw.
“He was rough but we’ll look after him and the doctor is on the case for those guys and a couple more felt it. So hopefully we can shake it off and look forward now to next weekend.”
Rangers won 3-1 against Morton after coming from a goal down to maintain their great run of form in the Scottish Championship.
The visitors took the lead midway through the first half when Denny Johnstone found the target.
Kenny Miller equalised in the 43rd minute and put Rangers ahead just three minutes into the second half.
Lee Wallace made it 3-1 to Mark Warburton’s side on 56 minutes, as Rangers went 15 points clear of second-placed Falkirk at the top of the league table.
Rangers will take on Falkirk away from home in the Scottish Championship next week.