Cities: Skylines readies itself for Euro 2016 with free DLC
Not only will they be able to build the stadium, but they’ll be able to customise the local team’s colours and enact stadium-related policies. You’ll also be kept abreast of the season, as you’ll have to plan around increased traffic.
Of course, having a stadium in your city will lead to increased income thanks to ticket revenue too, which you can then reinvest in your city.