Forest isn't in their peak form and that's the advantage that Chelsea will use over them despite playing away from home. Chelsea needs all three points in this match to enable them qualify for UCL next season, any result apart from a win will put them in the Europa cup competition. However, Tottenham has already qualified to the Champions League and English team is given only five slots.
Nottingham Forest lost their bad form in latest weeks of season and from a third position that was held solidly in many weeks, they fell down more and deeper with time. With bad performances recent weeks, they have been familiar with a position beyond top four, top five and have to accept a fact that they might finish this season with a sixth or even lower position.
They still have chance to climb up to top five or four if they manage to beat Chelsea and other above clubs won't get 3 points in the season's last match day. Only one more match, and Nottingham Forest players can make history with a ticket for joining Champions League but with whatever ending, this season is a massive successful season for them already.