David Gill has confirmed Manchester United are looking to bring in additional players over the summer but remained tight-lipped over the club's transfer priorities.
After missing out on the Premier League title on goal difference to rivals Manchester City, Gill revealed the club are in the market to strengthen during the close season - with Borussia Dortmund pair Shinji Kagawa and Robert Lewandowski recently linked with the club.
Manchester United are also believed to be monitoring Lille's Eden Hazard and Ajax midfielder Christian Eriksen and Gill admitted they are expecting a busy transfer window.
"We have to move on, we have to develop the squad and make sure that we are ready to go from the off in August this year," Gill told talkSPORT.
"There will certainly be activity, we've got some ideas now we have just got to bring them to fruition but it is not easy these days buying players."
However, Manchester United are resigned to losing the race for Hazard to City and Gill cautioned the club would struggle to match Roberto Mancini's side as they sought to adjust to UEFA's Financial Fair Play regulations next summer.
"Funds are available without a doubt," Gill is quoted in the Telegraph. "We can still pay very well in terms of wages and transfer fees.
"Clearly City have raised the bar. We have seen that with what they are prepared to pay for players and to them.
"But we need to move on. Financial Fair Play is just around the corner. It is a flagship programme for Michel Platini and how that is implemented and the sanctions that are imposed are going to be interesting."
Meanwhile, Manchester United defender Patrice Evra believes injuries played a significant role in the title race and remained adamant the squad would come back stronger next season when they will "win the league by many points".
In the aftermath of City claiming their first league title in 44 years, Evra admitted United threw away the title after going eight points clear with six games remaining. Sir Alex Ferguson's side were seconds away from defending their title, until Sergio Aguero's winning goal against Queens Park Rangers just 30 second from time saw City edge the championship on goal difference.
"I always say when someone is champions they deserve it," Evra is quoted on Goal.com. "But I can say to myself that we gave the title to City.
"It was just the last 30 second [on the final day] that made City champions. We received a lot of criticism this season, but we got nine points more than last season.
City played their best football. We didn't always play our best football but we still finished on the same points, so it makes you think that if we play our best football consistently throughout the season, then we're going to win the league by many points.
"That is why I'm confident [for] next year."