Rumours suggested that the England centre-back had asked for as much as £100,000 a week plus a £4.5m signing-on fee.
"It's disappointing when you see things in the press. You bite your lip because I didn't read one report that was correct," said the 26-year-old.
"It was upsetting, but my family and the clubs knew the real situation.
"It was really hard [to accept the accusation that I was greedy] because that's the perception I got."
Andre Villas-Boas confirmed that Cahill would be in the squad for this lunchtime's trip to Norwich City.