But it came suspiciously one game after the £89million man was involved in a huge bust-up with the Portuguese gaffer following the defeat at Newcastle - as SunSport exclusively revealed.
Montella, who took over at Sevilla in December, is taking charge of only his second Champions League game, while United boss Jose Mourinho has already managed 133 times in the competition.
"Of course [we can win the Champions League]", he said.
Last season, the Red Devils won the EFL Cup and Europa League.
Sevilla went out to Leicester at the same stage last season but have a chance to make amends against United as they aim for a first quarterfinal in Europe's elite club competition since 1958.
Saturday's 2-0 fifth round win at Huddersfield was a welcome boost at the start of a "massive week" that sees Mourinho's former side Chelsea arrive at Old Trafford after the trip to Spain.
Nemanja Matic has stated Manchester United are prepared for the challenge of facing Sevilla at the passionate and ferocious Ramón Sánchez Pizjuán Stadium on Wednesday evening. "I liked the team's spirit, but we need to improve technically and we need to score more". At home will be the best chance for the Spanish side to get a win and as a result, I am expecting a very attacking brand of football from them.
Sevilla has five goals in its last three matches, and it has scored at least once in its last nine games, but Montella thinks that isn't enough considering how well the team has been playing.
"I studied him as I was beginning as a coach", the 43-year-old Italian coach says.
"We are going to fight to annoy him because he is very strong". We are rather going for a 2-2 draw as our prediction, and this bet is available for 16/1 odds at the same bookmaker.