Before the 2015 Major League Soccer season can begin, a new collective bargaining agreement must be negotiated by the league and the players' union. 

Last time the two sides went to the negotiating table, the discussions went down to the final week of the offseason before the 2010 campaign. 

This time around, negotiations are expected to be intense in order to improve the rapidly expanding league, which will see two expansion sides enter the fray in March. 

Here is a look at five of the key issues surrounding the MLS CBA negotiations. 

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