Laravel hasMany relation on multiple columns

I'm trying to setup Laravel relations on an already existing database which I'm unable to change.

In this database there is a table named Teams with columns:

• Teamleader_1
• Teamleader_2

Furthermore there's a table named Users with a column:

• User_id

The relation between these tables is as follows: Users.User_id = Teams.Teamleader_1 OR Users.User_id = Teams.Teamleader 2

How can I setup a hasMany relationship between Users and Teams on both teamleader columns?

via Chebli Mohamed