Chelsea manager Thomas Tuchel has opted for a 3-4-3 formation with five changes to the team that lost to West Brom in the weekend.
Edouard Mendy starts in goal with captain Cesar Azpilicueta, Antonio Rudiger, who replaces Thiago Silva, and Andreas Christensen, on for Kurt Zouma, teaming up in defence.
Reece James plays as right wing-back with Ben Chilwell, who takes Marcos Alonso’s place on the other side, while Jorginho and Mateo Kovacic link up in midfield.
Mason Mount, who replaces Hakim Ziyech, Kai Havertz, on for Christian Pulisic, and Timo Werner lead the attack.
Meanwhile, Porto manager Sergio Conceicao appears to have opted for a 4-4-2 formation with four changes to the team that beat Santa Clara in the Primeira Liga.
Agustin Marchesin starts in goal with Wilson Manafa at right-back and Zaidu Sanusi, on for Nanu, at left-back, while captain Pepe and Chancel Mbemba, who replaces Diogo Leite, team up at centre-back.
Jesus Corona, who takes Sergio Oliveira’s place, covers the right flank with Otavio on the other side, while Liverpool loanee Marko Grujic, on for Mehdi Taremi, and Mateus Uribe link up in midfield.
Luis Diaz and Moussa Marega lead the attack.
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