Strachan chose an inexperienced side
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Two first-half goals sent Celtic crashing to defeat at the hands of Wisla Krakow in the second match of their pre-season tour of Poland.
Jean Paulista set up Pawel Kryszalowicz, who slotted past David Marshall inside five minutes.
Former Leeds and Barnsley midfielder Jacob Burns added the second, with a good finish from the edge of the area.
Celtic boss Gordon Strachan gave starts to Mark Wilson, Charlie Mulgrew, Simon Ferry, Paul Lawson and Craig Beattie.