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Chelsea signed Mario Pasalic as a youngster from Croatian side Hadjuk Split in 2014, but the midfielder is yet to make an appearance for the senior team.
The 25-year-old has been on loan with five different clubs and is currently on loan with Atalanta where he has been since 2018.
The Italian side signed Pasalic on a two-year loan deal with the option to sign him permanently for just £12.5m.
Pasalic has now blossomed into a fine midfielder and impressed for Atalanta with two assists as they defeated Valencia 4-1 in the Champions League round of 16 clash on Wednesday night.
Chelsea fans have now called for the club to bring back the 25-year-old and insists that £12.5m is too small for the midfielder.