
Lafferty missed Saturday's 3-0 friendly defeat by Bochum and will return from the pre-season German tour to have his injury assessed by a specialist.
Manager Ally McCoist said: "The doctor and the physios had a look at him and they decided that it was a niggle that wasn't going to clear up over here.
"We will know better when we get back, but it is a little concerning."
Northern Ireland international Lafferty was a regular scorer towards the end of last season and bagged a hat-trick as Rangers beat Kilmarnock 5-1 to clinch Scottish Premier League title.
"It's a big disappointment for him and it's a big disappointment for us, because he and Nikica Jelavic finished the season so well and we were hopeful they would start the season in fine form," McCoist told the Rangers website.
"However, that does not look like being the case with Kyle having this niggle."
Three second-half goals gave Bochum victory over McCoist's men, who also lost to Sportfreunde Lotte on Thursday.
Defender Madjid Bougherra has yet to feature on the tour but may return against Bayer Leverkusen on Wednesday.
The Algerian has been linked with a move away from Ibrox as he is entering the final year of his contract.
"We have not had an offer for him," added McCoist.
"He is a Rangers player and the one thing about Madjid is that he gives his all in every game he plays and I have no doubts that he will do that again.
"We are looking to strengthen a few areas and the defence is one of them.
"We definitely need to get one or two fresh faces in to help the lads and we will do that."
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