Chelsea boss Thomas Tuchel has declared Mason Mount brings an "aura" to his team.

Mount is expected to start against West Ham on Saturday, with Reece James, Timo Wener and Jorginho all fit to feature after playing no part in Wednesday's win over Watford.

With Mount in the starting line up, Chelsea's win percentage is 89 per cent this season. Without him, that reduces to 46 per cent.

"We know about this because it's a kind of statistic that is sometimes interesting," Tuchel said. "I first heard about these statistics in basketball in America and the influence from one player in five against five is much higher than 11 against 11 in football.

"It's not a statistic which guarantees you to start because this would be too easy. But it is something we are aware of and we will not deny that having Mason brings a certain attitude and an aura and a mentality on the field.

"It is very hard to drop him because even if he has a not so good game, you'll always get full energy and positivity and a wonderful approach."