How do you 'second best'?
Ignore the translation for "Most/Best" if it's not the top one
He's the most expensive player in football history
他是足球历史上最贵的选手
He's the second most expensive player in football history
他是足球历史上第二贵的选手
He's the third most expensive player in football history
他是足球历史上第三贵的选手
You can find it's using "第二贵" instead of "第二最贵"
In Chinese when talking about "最" it usually referring only the top ONE.