McDermott claims Southampton's need to stay in the Premier League is greater after spending nearly £30million in the summer transfer window.
McDermott said: "They have spent an awful lot of money but if we win on Saturday we go above them.
"When you have spent a lot of money sometimes there is a pressure.
"I can't be accused of being under that pressure here.
"We have two or three targets and if the budget's there, it's there. It comes down to finance."