Lewis Hamilton has ruled out making use of Mercedes' new Formula 1 psychologist.It has emerged that Dr Ceri Evans, who also worked with New Zealand's 'All Blacks' rugby team, was at the 2014 Chinese GP and could return at the 2014 Spanish GP on Sunday (May 11).Evans focused on the performance of engineers and mechanics, not drivers Hamilton and Nico Rosberg.Ahead of the 2014 Spanish GP, Hamilton the winner of the last three grands prix on the trot, was asked whether he too would think about working with a psychologist to improve himself as a driver.'UNLESS I START GOING CRAZY'Hamilton said: "Never. Never needed one and will never have one. So we'll never speak of it again unless I start going crazy."Hamilton said Evans being in China had "zero impact" on him.Also not planning to make use of Mercedes' new psychologist is Rosberg, who risks ceding his championship lead to Hamilton this weekend if he loses for a fourth straight time to Hamilton.Rosberg also laughed off suggestions he might start reverting to psychological 'mind games' to destabilise the notoriously emotional Hamilton.Rosberg said: "I am comfortable to keep on doing what I am doing. What I need is a normal weekend. I have not had one of those lately and then I will be able to turn things around."Stay with Wheels24 for the 2014 Spanish F1 GP weekend.