A six-goal thriller at the Sanchez Pizjuan threatened to end the Merengue's incredible unbeaten run, but their French star popped up to earn a tie.
All three members of the MSN were on target to reverse a 2-1 deficit at Camp Nou, with the Argentine swooping to decide the tense tie late on.
The Argentine duo were in fine form to ensure a perfect start to the year for the defending Serie A champions, who remain in pole position for yet another Scudetto.
Antonio Conte named a strong side to face the League One side and his players brushed aside their visitors at Stamford Bridge, with the Spaniard netting twice.
Zinedine Zidane's men extended their formidable undefeated streak - and their lead at the top of La Liga - with an emphatic victory.
A Yaya Toure penalty sent the visitors on their way to an easy victory over Slaven Bilic's men, ensuring they progress to the fourth round of the competition.