Lingard told Goal's Nizaar Kinsella:
"Rashford is flying. He is there to score goals, and he enjoys scoring goals.
"Every day he is practising in training and it is working on the pitch. Practice makes perfect, and he is always staying behind and practising on his shooting."
"In the last two games, he has been solid in midfield," Lingard said of Fred. "He is a real rock. We can rely on him when we press high to back us. He has been doing really well at the moment."
Rashford has enjoyed a prolific campaign with United and has already notched 13 goals in all competitions, matching the tally he achieved in each of the last two seasons.
In the Premier League, he has 10 goals and four assists.
Football statistician Dave O'Brien put that record in perspective:
O'Brien also discussed Rashford's form with former Premier League players Micah Richards and Leon Osman on BBC 5 Live Sport:
BBC 5 Live Sport @5liveSport
'With Marcus Rashford, we are seeing the development from a boy to a man' 🗣️ @MicahRichards, @StatmanDave and @Osman21Leon talk about #MUFC's front three, Marcus Rashford and the inconsistency under Solskjær Listen live 👇 📲⚽️: https://t.co/Ht2qES2rcg #bbcfootball https://t.co/iCyVwaPayC
The 22-year-old also has three goals and an assist for England this season, as further evidence of his improved production in front of goal.
He should be capable of surpassing Paul Pogba's total of 16 goals for United last season, and he has a good chance of reaching the landmark of 20 provided he remains fit.
As for Fred, he looked to have little future at the club at the start of the campaign.
He arrived at Old Trafford in a £52 million deal last year but made just 25 appearances in his first season, spending much of the campaign on the bench.
The Brazilian did not feature in United's final three matches last season, or in their first four of this season.
He has forced his way back into the team, however, per Dominic Booth of the Manchester Evening News:
Despite Rashford scoring a brace against Spurs, football writer Liam Canning thought Fred was the team's best performer:
The 26-year-old followed that up with a similarly strong showing against City.
For both players, it will be important for United to maintain their good form consistently over a long period.
The Red Devils will return to fifth place if they beat Everton on Sunday, unless Wolverhampton Wanderers—who have a goal difference of four compared with United's six—beat Tottenham by a significant margin.
If United overcome the Toffees, they'll be just two points off a place in the top four.