we need to perform a phagocytosis experiment and will use those particles, but we need to know the number of the cells at this concentration.
You will have to set up preliminary experiments with different numbers of cells In 100 ul. the results will tell you what is workable.
I don't know what kind of cell do you have but you can use Neubauer chamber if you really want to estimate the number of cell per unit volume.
Another way is to use a flow cytometer, if you turn the FSc threshold down and turn FSc area and SSc area on log you can count these particles, either via using a known ratio of counting beads or using a newer flow cytometer that counts particles per ul. It was a long time ago, but I seem to remember that unlabelled zymosan was around 165,000 particles per microgram. I also counted doublets as two particles, but it didn't make a big difference to particles per ul. You could also do the same for pHrodo bacteria.
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