Seems highly unlikely, Krul a good choice for long term replacement for Cech, sure, the question would be how much do Chelsea want to spend in one transfer window/year, and if the money is best spent on huge improvements say on the wings/right back/AMC, or a minor improvement in goal.
Of course wage wise shifting Cech and getting Krul on a wage probably less than half could be a start of Chelsea replacing people with lower wage players to get within FFP long term.
Meh, Tiote would be a very good option for them, again Tiote on say 50-60k a week vs Essien who has been crap for going on 3 years, and is probably on well over 100k a week.
Nothing wrong with Newcastle being a selling club, get 40mil, buy a couple 10mil more established players to replace them and spend another 20mil on a few younger/promising players in positions you need to strengthen.