Odion Ighalo said watching Manchester United's struggles since Sir Alex Ferguson's retirement has made him "angry."
The Nigeria striker is a boyhood United fan and said it has been hard to watch the club's slide since Ferguson left in 2013.
Ighalo sealed a shock move to Old Trafford on deadline day and is now determined to help put things right as part of Ole Gunnar Solskjaer's squad.
"There is transition in life in everything you do," Ighalo said.
"So it is difficult sometimes as when the team is losing games, as a fan you get angry. Now I'm in the club I have to give my best to make sure we try to win and get results.
"Some games are going to be difficult because some big teams are spending more money in the Premier League and Europe. It is going to be more difficult, but I think this team, we have young players and working this way, I think we have a better future."
Ighalo marked his first United start in the 5-0 win over Club Brugge with his first goal, a close range tap in after Juan Mata's ball back into the box.
It was greeted with a celebration from Solskjaer on the bench and Ighalo has revealed his new manager was one of his heroes growing up.
"I watched him when I was young," Ighalo said.
"I watched a lot of them -- Andy Cole, Dwight Yorke, Ole. I watched them, Teddy Sherigham, when I was young. Playing for him now is great for me. I'm very happy."
Ighalo may be asked to start again when United travel to Goodison Park to face Everton on Sunday because of doubts over the fitness of Anthony Martial.
The 30-year-old is still getting up to speed at Old Trafford after going months without a game in China and conceded it may take him a while to re-adapt to the pace of the Premier League.
"I'm getting better," he said. "I know I'm not 100% fit. My last game I played was Dec. 6. That's when I played in the Chinese league, in the FA Cup final in China.
"So I'm getting there bit by bit. The league is faster, stronger, you need more strength. I'm getting better every day, but I'm not 100% fit.
"I'm just one of the team. We have to work together as a team. I am here to contribute whatever it takes to move the team forward."