However, officials at the Catalan club have already said the designs would not bear any resemblance to Foster's recently unveiled Wembley, with its now-famed arch.
Instead, it is understood, the practice is to add an extra 10,000 seats to the stadium's existing 98,787 capacity and that the majority of the original structure, dating back to 1957, will be retained.
The competition-winning 250 million euro project was chosen ahead of designs by Carlos Ferrater, Herzog & de Meuron and Japanese-practice Sanaa and is to be unveiled tomorrow.
Describing the proposals and the thinking behind the scheme, Barcelona director Joan Franquesa said: 'Barca is the reference - we have a specific singularity.
'The proposal will not be similar to Wembley in terms of aesthetics, but will reflect its modernity and functionality.'