Manchester United tweaked their tactics to suit Bruno Fernandes as they came from behind to win away from home again in the Premier League.
United trailed West Ham 1-0 at the pause at the London Stadium but Fernandes and Marcus Rashford came on at half-time to spark a 3-1 comeback victory.
Rashford replaced the injured Edinson Cavani but Fernandes was introduced for Donny van de Beek in a tactical move that allowed the playmaker to thrive ahead of Paul Pogba and Scott McTominay.
"First-half, we had loads of the ball but couldn't create anything," Solskjaer said. "Second-half, I thought we tweaked a couple of things tactically, just small little things, making the space bigger, a couple of runs that we made that created space for Bruno in the middle.
"The quality of the finish - the three goals were all an exceptional finish - and that was the difference between us and them today. They had chances as well in the first-half but they couldn't score. The quality we had in the second-half was too high.
"We’re playing against a very good side, they’ve drawn to Tottenham, they've drawn to City, they should have got points against Liverpool, they beat Wolves and they beat Leicester.
"They're a very, very good team and that made it difficult for us because they've got an X-factor and they've got the quality in the big moments of the game, set-plays definitely, counter-attacks.
"We had the ball - I’m sure we had about 65% possession in the first-half - but we couldn't control their big moments and the goals. When we got on the front foot we looked like ourselves.
"We have done this too many times - coming back from 1-0 down - for it to be a coincidence to have this character and the mentality is one of the biggest things that I take from these away games.
"They always believe in themselves, we trust ourselves, there’s no shouting and screaming, and all that, we believe in our teammates and believe in ourselves."
