using System;

namespace ConsoleApplication1
{
    class Program
    {
        private static void Main(string[] args)
        {
            var x = new Manager<ISoccer>();
            x.GetManager();
            Console.ReadKey();
        }
    }

    public class Manager<T> where T : IBallGame, new()
    {
        public T GetManager()
        {
            return new T();
        }
    }

    public interface IBallGame
    {
    }

    public class ISoccer : IBallGame
    {

    }

    public class Soccer : ISoccer
    {

    }
}