A model using wake oscillators is developed to predict the 2D motion in a transverse plan of a rigid cylinder in a flow. This model of the wake dynamics is validated on a single cylinder for which we consider both transverse and in-line response. The good agreement between the model and the experimental results allows to use this model as a simple computation tool in the prediction of 2D Vortex-Induced Vibrations (VIV) and after futher development Wake-Induced Oscillations (WIO) effects.