Foreign institutional investors (FIIs) were net sellers of Rs 567.50 crore on July 17, Monday according to data released by Sebi today.While FIIs made gross purchases of Rs 764.80 crore, gross sales totalled Rs 1332.40 crore.Mutual funds (MFs) were net sellers of Rs 38.26 crore on Monday. MFs made purchases of Rs 242.55 crore and sales of Rs 280.81 crore.