KEY ISSUES FOR REDS ANALYSIS RICHARD FAY.
| FRED IS BECOMING RELIABLE BUT IS HE TRUSTED? IT'S taken him a while to settle but United are finally beginning to reap the rewards of their investment in Fred last summer.
At the time little was known about the Brazilian other than his sporadic displays in the Champions League.
Nobody quite knew what to expect from the 26-year-old but he is starting to make the defensive midfield role his own. Yes, he was at fault for accommodating Lionel Messi's brilliance on Tuesday night but criticising him for being shown up by the greatest player of all time is harsh given his recent progress.
There is still plenty of room for improvement for Fred at United but in order to unlock his true potential Ole Gunnar Solskjaer must persevere with his backing and allow him the game time to flourish.
| SANCHEZ DESERVES TO START PERHAPS the one consolation of the damning defeat against Barcelona was the brief cameo from Alexis Sanchez.
The tie was already over by the time the Chilean made his return to a warm reception at the Nou Camp but that didn't stop him from making a mark on the game.
Sanchez looked rejuvenated and was quick off the mark as he pressed high and positive during his limited appearance.
| GUEYE'S SUMMER AUDITION A FAIR few eyebrows were raised when reports suggested that United were monitoring Idrissa Gueye ahead of the summer transfer window.
Marco Silva has already played down the rumours and intends to keep him this summer, despite the player's failed move to Paris Saint-Germain in the January transfer window.
Ander Herrera could hold the key to the Senegalese midfielder's immediate future with a move to the French champions seemingly less likely if they were to sign the Spaniard instead.