Fulham manager Marco Silva is said to be increasingly dissatisfied with the club's lack of movement in the transfer market as the start of the new Premier League season approaches.
So far, the Cottagers have completed just one permanent signing this summer.
Benjamin Lecomte is that sole arrival, with the goalkeeper joining on a free transfer following his departure from Montpellier.
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The experienced French shot-stopper, 34, has signed a two-year contract and is expected to serve as backup to established No. 1 Bernd Leno.
Fulham manager Marco Silva is said to be increasingly dissatisfied with the club's lack of movement in the transfer market as the start of the new Premier League season approaches
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Lecomte has spent most of his career in France, with short loan spells at Atletico Madrid and Espanyol his only ventures abroad.
While Fulham believe they have a well-rounded squad, The Sun say their transfer strategy this summer has largely focused on retaining key players rather than bringing in new faces.
The club recently secured Kenny Tete to a contract extension, even after interest from Everton, and have resisted offers for several key names, including Rodrigo Muniz, Adama Traoré, Antonee Robinson, and Joachim Andersen.
Both Muniz and Traoré were the subjects of transfer speculation, with links to Leeds United and Nottingham Forest, respectively.
Fulham are also putting greater emphasis on youth development.
One academy product generating buzz is 18-year-old Josh King, who made eight Premier League appearances last season and is expected to be part of the first-team plans again.
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Benjamin Lecomte is Fulham's sole signing of the summer transfer window as the new Premier League season approaches
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Club insiders feel the squad has sufficient depth, with two solid options per position, and are reluctant to stretch the wage bill unless absolutely necessary.
Silva, however, is believed to have anticipated more reinforcements by this stage of pre-season, especially with the opening match at Brighton just nine days away.
While the Portuguese coach has previously turned down big-money offers from Saudi Arabian clubs to continue his project at Craven Cottage, it's now been suggested that his patience is wearing thin.
His representatives held preliminary discussions with Fulham last season regarding a possible contract extension, but with little progress in the transfer market, the chances of Silva signing a new deal now appear slim.
Fulham finished 11th in the Premier League table last season.
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Marco Silva has worked wonders at Fulham over the years but his long-term future at Craven Cottage is now shrouded in uncertainty
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The Cottagers won 15 of their 38 league matches and picked up 54 points.
Fulham face German side Eintracht Frankfurt in their final pre-season clash on Saturday (5pm). They'll then lock horns with Brighton in their Premier League opener on August 16 (3pm).