Newcastle winning their match or not will not affect Chelsea position in the table like the teams behind them. Newcastle have the same points with Chelsea but they have more goals which is the reason they are above Chelsea on the table. Chelsea should be more concerned about Aston villa and Nottingham forest because these two teams are the threat that will hinder Chelsea from qualifying for the champions League. For that prediction to come to pass, every teams in that list must win their next game and there won't be any changes to that list.
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Chelsea still stands a good chance of qualifying for the UCL so they should just focus on winning their match against Nottingham forest and forget about what the results of their other contenders in the standings for the UCL would be playing. It doesn't look like an easy win can be gotten because Nottingham Forest already has the home advantage and being their last game of the season they would want to end it in grand style for their fans who would be cheering them. It's actually going to be tough.