PSV Eindhoven's Ivory Coast striker Arouna Kone and Ajax forward Klaus-Jan Huntelaar are two of the most recent players linked with a possible move to Anfield in the summer.
"We have a number of targets, and I am receiving interesting phone calls all the time," he said. "We are monitoring situations all the time and there is no urgency yet."
"If we bring in players from Spain, they only finished playing a week ago so they will need a longer break, but I would like somebody in before we start pre-season training.