The chances are + (that)... 已经成为英语的一种固定句式，表示对将来的推测。意思是：“有可能......”。that 引导表语从句，that 可以省略。因为are 是现在时态，that 从句表达将来事件，用一般将来时。例如：

The chances are that the guest team will win.  客队有可能会获胜。

The chances are that you will win the prize.  你可能会获奖。

The chances are you won't have to pay.  你可能不用付钱。

The chances are a hundred to one that he will win.  他只有百分之一赢的可能性。

The chances are that he will elected the president.  他有可能被选为总统。

The chances are that you will have that version as well.  很可能您也会安装那个版本。

If we can swim, the chances are that we can save our lives.  如果我们会游泳的话,我们就有可能得救。

主句的意思是：你可能会看到学生们穿着印有熟悉标志的李宁运动服。