Chelsea might rue the failure to sign certain players this January in order to fuel its push up the Premier League table. Taison shouldn't be one of those players.
After an initial €11m (£9m) bid was rejected, the Ukrainian champions paid the €20m release clause to sign the Brazilian.
"I am happy to play for such a great club," Taison told the club's official website. "I played a lot against Shakhtar and I have a lot of information about them. I know Shakhtar's Brazilians. I really want to help the club win new titles.
"I'll train and work, respecting everyone who plays for the club. In the first place I have respect for all. Of course, I will try to play as best I can."
The Blues could use benefit by bringing in reinforcements, but it's a bit puzzling as to why Taison was targeted. His preferred position is on the left wing.
Chelsea is already loaded with plenty of players capable of of playing out on the left in Juan Mata, Eden Hazard and Marko Marin. Mata and Hazard are world-class midfielders.
There's more than enough flair in this squad. At times it's too much, with the club lacking the necessary spine in midfield.
That's improved under Rafa Benitez, but the club could fall into the trap of trying to appease all of its playmakers at the same time.
Taison is also capable of playing in a secondary striker role. The position has been an issue, but the club already signed Demba Ba this month, and Romelu Lukaku will return from loan at the end of the season.
There's a difference between buying players to improve your club and simply buying players to spend money.
With no Champions League football for the rest of the season, Chelsea is losing out on quite a bit of money this year. If the FIFA Financial Fair Play rules are enforced as advertised, the Blues can't afford to be as free-wheeling during transfer windows as they once were.
While Benitez could use some help in midfield, it's not in the attacking third of the pitch.
The club could allocate the money it would have spent on Taison to the prospective transfer of either Luka Modric or Marouane Fellaini.
Andrew Dillon of The Sun reported that the Blues are going to pursue bringing Modric back to the Premier League.
Laurie Whitwell of the Daily Mail reported that Fellaini is also another major target for Chelsea during the January window.
Both of those players would be much better fits because of their ability to play in more of a central position. In addition, Fellaini is flexible enough to provide an option in attacking midfield and as an emergency centre-forward.
Frank Lampard looks like he's on his way out of Stamford Bridge. Chelsea is going to need somebody to be his long-term replacement.
That person wouldn't have been Taison.