The 24-year-old sustained the injury when on 82 and completed the rest of his knock of 107 not out with the help of a runner.
Immediately after the match, which India won by eight wickets, Yuvraj admitted on TV that he may be out for "some days".
Skipper Rahul Dravid also said there was indeed a bit of concern over Yuvraj's fitness.
"We will soon know how serious the injury is and when he can play, but I have to admit it is a bit of worry." he said.
An unfit Yuvraj might make way for Sourav Ganguly to sneak in to the Test squad as the ex-skipper is in direct competition with the Punjab player for a berth in the middle-order.
BCCI Secretary Niranjan Shah said in Mumbai that an announcement on Yuvraj's fitness would be made in a day or two.
Team physio John Gloster is expected to assess Yuvraj tomorrow before submitting the fitness report to the Cricket Board. The Indian squad for the three-Test series, beginning in Nagpur on March 1, is to be named on February 23.
Yuvraj emerged as one of the heroes for India on the tour of Pakistan which ended yesterday with India clinching the one-day series 4-1.
Declared man-of-the-match in the final one-dayer and man of-the-series, Yuvraj scored 344 runs in the five one-dayers at an astounding average of 172. He also made 122 in the final Test in Karachi which India lost by 351 runs to concede the series 1-0.