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Demba Ba is a professional footballer and perhaps it is only natural that he wants to push himself to play at the highest level possible—at 27 he may not get another chance to move to a big Champions League team if he signs a new deal at Newcastle now.
On the other hand, maybe if playing regularly for a big team was his main motivation, contract negotiations would go a little smoother.
If he stays at Newcastle he will remain as the key striker, will keep playing in a team geared to supplying him with chances to score and will probably earn the admiration of the supporters even further for committing his best years to the club who took a "gamble" on him and his knees in the first place.
Newcastle are far from the side who took the Premier League by storm for a few months last season and they need their best players to be firing; if they lose Ba for the small fee mentioned, then they will struggle to find a similar replacement.
Time will tell if Ba gets the move he seems to be after, but it might yet be that if he lowers his demands slightly and Newcastle invest a little more in him, they encourage Ba to sign a new contract and keep their best goal scorer.
Big fish in a small pond maybe, but Ba is a successful fish at present and as much as it might be the crowning moment of his career if he joins Chelsea, it could also be the end of his best spell of his career.
Statistical data from WhoScored.com