The Blues have managed to secure the striker’s signature after activating a £7.5 million release clause in his Magpies contract.
Ba has been in prolific form during his 18 month stint at St James’ Park, scoring 29 goals in 54 appearances, but the Senegal forward insists moving to Chelsea was too good an opportunity for him to turn down.
“When the club who won the Champions League wants you, the decision making is very easy,” Ba told Chelsea’s official website.
“This club is massive and that’s something that helped the decision a lot. It was not a hard one.
The 27-year-old also revealed he was happy he would not have to play against Chelsea any time soon, after the Stamford Bridge outfit condemned the Magpies to comfortable 3-0 and 2-0 defeats during the past 18 months.
And the former West Ham striker declared that moving back to London was another important factor in choosing the Blues.
“I remember the last game we [Newcastle] played [against Chelsea]. It was tough. They dominated the whole game against us and we lost 2-0 at Stamford Bridge.
“When you see a team coming to Newcastle and winning 3-0 like they did last season, you know it will be hard to face teams like that.
“Now I am on the other side I will be happy to do the same to the other teams.”
“I am also happy to be back in London. It means everything to be here.”
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