Gvardiola was outstanding in the 3-3 draw at Champions League opponents Real Madrid.
Modric also featured in the quarterfinal first-leg and Gvardiol said: It means a lot to me.
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"It was nice to see the captain of my team playing against me. I know Modric is getting older, but he still plays well."
The return leg against Real Madrid will take place on April 17 in Manchester.