According to reports, both clubs have their eyes on Mangala as both teams are supposed to be looking at boosting their defences.
Another club who have been linked with the player is AC Milan.
Porto are braced for moves for the defender who is rated as one of the best young talents in the business, while the player himself says that he is happy where he is, but would be interested in a move to the Premier League.
Speaking to Sky Sports, the 22 year old said: "I have a contract here till June 2016, however all players want to play one day in the top league in Europe, I am no different to that.
"To be linked with clubs of the stature of Tottenham or Manchester United is the best feeling.
"I want to finish the season strongly and see at the end of the season if the reports are true.”