Former Olympic gold medallist Kelly Holmes believes that hosting the Games will create advantages and disadvantages for Great British hopefuls.
Holmes, who won Olympic gold in the 800m and 1,500m in Athens in 2004, feels that Team GB will witness a mixed bag of results during this summer's Games.
"Around 75% of the team are going to be first-time Olympians," Holmes said. "Some of those are not known at all, they are going to be so overwhelmed that they are in the team that that's the biggest achievement.
"There are going to be some who are already in Great Britain teams but are not yet medallists who feel this is their platform and we will have brand new stars born, people that we don't know that become champions.
"On the established side there will be those that we expect to do well that will pull it off and will remain our big champions, and then those that we expect to be champions will just fall at the wayside because it's become too much, they've put too much expectation on them and the rest of the country have."
The London 2012 Games get underway in 99 days.