While Juventus will be buoyed by the returning Ronaldo, one player who has shone in his absence may find himself left on the bench.
Sometimes the symbolism is inescapable.
On a night where he marked his 125th Champions League goal, Juventus forward Ronaldo was once again in blistering form.
Ronaldo was back for his first appearance since suffering a thigh injury playing for Portugal last month - it was his first game for Juventus since netting the hat-trick that dumped out Atletico Madrid in the last 16.
"He was in good form and I hope to have him at my disposal for the return leg", Allegri said. That scenario places this contest in a very interesting position as Ajax Amsterdam don't have the quality to attack Juventus for 90 minutes without being seriously exposed in defence.
Ajax stunned Real Madrid in the Round of 16, taking down the Catalan giants 5-3 in the two-game set. "The substitutes are important, as we've already seen".
Bernie Sanders Confirms He's Now a Millionaire
Senators Elizabeth Warren of MA and Kirsten Gillibrand of NY have both released a decade of their own returns. But since his 2016 run for the presidency, Sanders' financial fortunes have improved.
Ted Lieu tried to smear Candace Owens, then she responded
The problem with the clip Lieu showed? "Of all the people Republicans could have selected, they picked Candace Owens ", Lieu said. One Republican, however, felt that the director of communications for Turning Point USA acquitted herself well: Donald Trump Jr.