Liverpool defender Glen Johnson says Luis Suarez's will to win is greater than anyone else he has ever met.
Suarez has been in sensational form this season, scoring 15 goals after missing the first six games of the season through suspension.
Suarez has never been too far from controversy throughout his career - Liverpool boss Brendan Rodgers often refers to the 26-year-old playing "on the edge" - but Johnson believes that fighting spirit is what makes Suarez so effective.
"I've not known anyone like him in terms of living on the edge and wanting to win so badly," Johnson said.
"There is a fine line and that is probably why some people get frustrated when things aren't going their way - sometimes that's a good thing and sometimes it's not such a good thing.
"Obviously he had a few little mistakes - outbursts - on the pitch but nine times out of 10 he is perfectly normal and that is what we are seeing now.
"Providing things don't stir up again you are seeing what we see every day now."
Owner John Henry stressed in August that he would not entertain selling Suarez to a rival and Johnson says that the club must stand firm if they are to challenge for the title.
"Usually some owners will say that to push the price up but John Henry said that and stuck by his guns," said the England defender.
"I think that was great and if we want to get the club back to where it belongs we need all our best players. He is clearly a massive player for us and some of the goals he has scored have been laughable."
Johnson says that the squad has real strength in depth but admits other players have to start helping Suarez.
"We've not dropped outside the top four once and Luis didn't play for the first five weeks," he said.
"That is another sign that the squad is brilliant. We need Luis to play and continue this form but we have a good squad, it is not just all about Luis.
"Clearly we want to be getting goals from set-pieces, goals from midfielders, everyone chipping in, you can't just lean on one person.
"Last season we were only a bit of luck away from doing what we are doing this season in terms of we absolutely battered teams and ended up drawing 0-0 too many times.
"At the moment the goals are going in so we are getting the points. I guess people are saying we're not title contenders because we haven't been that for the last couple of seasons.
"But we have a different team and squad and we are clearly fighting for the title. If that happens every week then we will be proving a lot of people wrong."
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