I think the game is open to be won by either of Chelsea and Newcastle United. While Chelsea are knownn to be an inconsistent team and poor in front of goal; this season Newcastle United has also been inconsistent and injury ravaged which is enough reason to help gamblers understand its either any team wins or a draw ensues
Personally, i think Chelsea will win the tie, they are in good spirits and better form as well.
Although considering the injuries most Newcastle United players are having that could be the only way Chelsea could beat them because Chelsea knows how to take advantage of weakness because that's exactly what happened to there match against Tottenham Hotspur, however Tottenham Hotspur was actually pressing them until they had a red card and some injured players, so Chelsea decided to take advantage of the opportunity immediately and win Tottenham Hotspur.
So there is every likelihood that they will do the same to Newcastle United if they sees any weakness from them.