Several studies dealt with uncertainty on games from different points of view. Uncertainty of strategy sets, pay-off functions, and uncertainty in the number of players were investigated by many authors, but no one focused on uncertainty in players' collusion. To represent uncertainty certain deterministic and stochastic information formulas are used. We show how the strategy selection process of a certain player depends on the type of information he has. Then we provide solution concepts for different types of information and evaluate the value of information. The paper illustrates some examples on a simple one-product oligopoly model.