WATCH Barcelona v Real Betis LIVE on beIN SPORTS, Monday 21 August

Ernesto Valverde is determined to move on from the disappointment of losing Neymar and ensure Barcelona makes the signings it needs in the transfer market.

Barca lost Neymar to Paris Saint-Germain in a shock world-record €222 million ($329.1 million) move and his absence was noticeable as Barca was humbled in a 5-1 Supercopa de Espana defeat to arch rival Real Madrid.

Its misery was worsened by a hamstring injury to Luis Suarez in the second leg of that tie which will keep him on the sidelines for at least a month.

However, Valverde says Barca has no time to wallow and is keen for the club to work on bulking up the squad, with Liverpool's Philippe Coutinho and Borussia Dortmund's Ousmane Dembele the subjects of reported rejected bids.

"Injuries can happen, as with Luis Suarez, and I understand that losing to a main rival and not winning a title can cause disappointment," he told a pre-match news conference ahead of Barcelona's LaLiga opener with Real Betis. 

"But the loss of Neymar was something sudden and surprising. It makes us change our plans a bit. We must work in another direction to rearm ourselves.

"We have to step forward and not look back."

However, with talk in England of a change to the scheduling of the transfer window, Valverde too would have liked to have seen all moves concluded by now.

"I would like the transfer window to close as soon as possible and I would like to have a window in accordance with the requirements we have," he added. "I cannot say more than that.

"Football has changed a lot. When I was a player, the window closed on July 15 and now it is not closed until the last minute. Players are signed and sold during the pre-season. It happens here and in other clubs.

"I would like to have the team at the beginning to work, work the systems, know what I have, but I know that, until 31 August, it cannot be.

"It can happen that a team changes 11 players between the first day [of the season] and 1 September."