The option carries a minimum buyout of $600,000, which could rise to $1.5 million, depending on performance.
Jonathan Kodjia has joined Aston Villa from Bristol City in an £11m deal which could rise to £15m.
Everton later confirmed Nigerian frontman Anichebe had left them to sign for West Brom for a fee which could rise to £6million.
Financial firms are preparing to dole out huge amounts of stock at depressed prices, the value of which could rise substantially in a few years.
That said, when the water is flowing in 2016 the county must pay as much as $113 million annually, which could rise over time.
That overhaul could add as much as 50 cents a month to consumers' phone bills immediately, which could rise to $2.50 a month in five years.
The center, which could rise as many as 15 stories and has the blessing of local officials from the mayor on down, makes some people uneasy.
But officials said they would be monitoring local rivers and waterways, which could rise out of their banks in the coming days due to the heavy rains.
They raised €37m (plus the money for Gabriel, which could rise as high as €19m) and spent €43m bringing players in.
In August Manchester United paid an initial £36m, which could rise to £58m, to Monaco for Anthony Martial, who was then also 19.
Brazil thus begins the year with total debt of more than $250 billion, which could rise if the real continues to weaken.
