The Celtic supporters have been getting impatient at the lack of transfer activity over the past couple of weeks. After listening to Brendan Rodgers speak about adding quality for months now, the fans went into the January window with high expectations. One player that had been continually linked to the club is former Dutch u21 striker, Sydney van Hooijdonk. TBR Celtic told yesterday how transfer specialist, Fabrizio Romano, told how there was ‘concrete interest‘ from the Parkhead club. We also told how Mark Guidi shared that Celtic are keeping tabs on the 23-year-old so there was a real sense…