Real Madrid goalkeeper Thibaut Courtois will be out for up to six weeks with a leg muscle injury.
After the restart, Szczęsny produced an excellent save to deny Arda Güler following a quick counterattack from Vinícius.
The result secured Madrid’s fourth consecutive UCL victory and a crucial advantage heading into the second leg at the Santiago Bernabéu.
The victory will be a huge relief for Vinicius after losing the Ballon d’Or to Rodri.
FIFA made the revelation in the early hours of Friday, with the duo going up against some of the very best footballers in their respective categories.
Despite their strong first half, Dortmund knew they would face a fierce second-half onslaught from the reigning champions.
Lookman bagged a hat-trick as Atalanta won its first-ever European trophy last season.
It was a goal to savour for Watkins who has played only 30 minutes in two appearances in Germany.
The 20-year-old scored 19 goals and assisted six times as Real Madrid beat second-placed Barcelona to the title.
He scored the winner at the Santiago Bernabeu on Sunday as Madrid beat Barcelona.
