Al-Hilal have increased their already huge offer to Lionel Messi, according to FC Barcelona transfer market expert Gerard Romero.

A Saudi delegation traveled to meet Messi on Monday after he played his last game for Paris Saint-Germain at the weekend.

Messi is a free agent on June 30 and, according to GOAL, shocked the Saudis when requesting that his move to Al-Hilal is delayed until 2024.

GOAL reported that the Saudis informed the Messi camp their offer of €500 million ($534 million) a season won't be the same next year.

According to Romero, however, Al-Hilal increased the value of the proposal which is a development that ties in with what Toni Juanmarti reported last week when he tweeted that there was a belief in Saudi Arabia that the Pro League team might have to improve their package to "achieve the definitive yes".

Footmercato previously reported the offer as €1.2 billion for two seasons and already accepted by the Messis on Sunday. Early last month, El Chiringuito reported it as €350 million per term and already taken by Messi who would be joined in the Middle East by former Barca teammates Sergio Busquets and Jordi Alba.

Acting as the agent of the seven-time Ballon d'Or winner, Jorge Messi has denied that his son has an agreement in place with anyone.

The patriarch of the Argentine family meeting with Barca president Joan Laporta at his home, and telling Romero's Jijantes FC channel that his son "would love" to come back to Camp Nou was taken as a positive sign that Messi will don Blaugrana once more.

This was because these developments occurred after Relevo reported that Barca had received the green light from La Liga for their viability plan which sets out how they will sign new players such as Messi amid their financial difficulties.

On Tuesday, though, Romero sees Messi's return as now "very, very difficult".

Shortly after Romero's latest reports were released, Fabrizio Romano tweeted that sources at Al-Hilal had denied any knowledge of any improved offer and that the proposal is still the same as the €1 billion ($1.1 billion), two-year package revealed in April.