The Blues take a precious 2-0 lead going into the 2nd leg next week.
Mason Mount - 9
The midfielder was once again the best player on the pitch and scored the all-important goal - a brilliantly taken goal in the first-half.
Edouard Mendy - 8.5
Porto gave Chelsea a tough fight through the game and the Blues needed the solidity Mendy provided with his saves to hold on to their lead.
Jorginho - 7
Chelsea's midfield wasn't at its best during the first leg but the Italian made a key difference with his lovely forward pass to Mount before the 1st goal.
Kai Havertz - 5
The German started ahead of Olivier Giroud in a false 9 role but failed to really get into the game throughout the contest. Missed a huge chance before being subbed off at the hour mark.
Ben Chilwell - 9
The fullback was having a solid game but rose to occasion as scored late in the game to seal the win for the Blues. Chilwell capitalised on a mistake and wonderfully went past the keeper before tapping in.
Andreas Christensen - 8
The defender made up for his poor performances last weekend by putting in a strong shift against the Portuguese side - winning 5 of his 6 aerial duels while also achieving a 95% passing success rate.
The Rest: Azpilicueta - 7, Rudiger - 7, James - 8, Kovacic - 7, Werner - 5, Giroud - 6.5, Pulisic - 7, Kante - N/A, Thiago Silva - N/A, Emerson - N/A