Manchester United boss Jose Mourinho says his squad needs "a bit more" to compete with other Premier League squads.
The Portuguese was speaking after his side's 2-0 win against Manchester City in a friendly game.
He says other teams - including West Ham United - are signing important players and the Red Devils must bring at least one more player to be competitive.
"It was a very good training session," he told reporters.
"That is what we thought when we organised the pre-season. Two matches against MLS teams and then we move on to the best teams in the world. Obviously City are a better team with better players than the MLS teams.
"They demanded more from us, more intensity, more concentration, more quality defensively, more quality on the ball so it was a fantastic training session.
"They have very good players, they play quality football, we had to play well, especially when the game had more quality in the first half.
"[Another signing?] I don't know, I don't know. I am not in control of that. The credit of Lukaku and Lindelof to be here on time, the credit is not mine, it is Ed Woodward and his team.
"I thank him for that fantastic work to bring us two very important players for us. But we need a bit more when you see the other teams in the Premier League, like Man City, Liverpool and West Ham, the way they get players, good players, important players.
"The champions have bought three fantastic experienced players. I am thinking about West Ham for the first match of the Premier League. They have got Joe Hart, Chicharito and Arnautovic. It looks like they are playing to win the Premier League too. The teams are fantastic in the market. I am waiting for a bit more."
