Brentford 3-0 Tottenham: Mamadou Sangare stars as Spurs suffer nightmare opening-day defeat

Tottenham's expensive summer rebuild endured a disastrous first Premier League test as Brentford produced a dominant performance to secure a 3-0 victory at the Gtech Community Stadium.

Roberto De Zerbi arrived with expectations of overseeing a significant transformation after Spurs narrowly avoided relegation last season.

Tottenham have responded by investing heavily in their squad, with their summer spending potentially set to pass £300million once proposed deals for Savinho and Omar Marmoush are completed.

However, their opening performance offered an uncomfortable reminder of the problems that plagued them last season.

Keane Lewis-Potter, Vitaly Janelt and Michael Kayode were all on target as Brentford comfortably dismantled their London rivals.

While Tottenham's expensive rebuild has attracted plenty of attention, it was Brentford's own major summer investment who stood out.

Mamadou Sangare arrived from Lens for a club-record £41million and produced an impressive Premier League debut.

The midfielder had been expected to play an important role in Brentford's plans this season, and his first competitive appearance provided an immediate indication of why the Bees were prepared to break their transfer record to sign him.

Sangare helped Brentford control the midfield battle and set the tone for a performance in which Tottenham struggled to impose themselves.

Against a Spurs side strengthened considerably during the summer, his influence was particularly encouraging for Brentford.

For De Zerbi, the manner of the defeat will be particularly concerning.

Tottenham have spent heavily in an attempt to move away from the struggles of last season, when they found themselves involved in an unexpected battle near the bottom of the Premier League.

A new manager and significant investment were supposed to provide the foundations for a different campaign.

Instead, Spurs were comprehensively beaten in their opening fixture.

Brentford were able to expose familiar weaknesses despite the changes Tottenham have made to their squad, leaving De Zerbi with plenty to address immediately.

One defeat will not define Tottenham's season, particularly with further additions expected before the transfer window closes.

But after such a major summer overhaul, supporters would have expected a much stronger opening statement.

The afternoon could hardly have gone better for Brentford.

Lewis-Potter, Janelt and Kayode shared the goals, while Sangare provided an impressive demonstration of what he can bring to the midfield.

Brentford entered the new campaign hoping their own summer investment could help them push towards European qualification, and beating Tottenham 3-0 represents an excellent start.

For Spurs, the result immediately increases the pressure to ensure their remaining transfer business delivers.

Savinho and Marmoush could provide further attacking quality if their moves are completed, but De Zerbi will also need to find solutions on the training pitch.

Tottenham have changed plenty during the summer. Their first 90 minutes of the new Premier League season suggested the transformation is far from complete.

Tottenham must respond quickly after an opening performance that raised immediate questions about how far De Zerbi's rebuild has progressed.

Further reinforcements could arrive before the transfer deadline, with Spurs working on deals for Savinho and Omar Marmoush. However, new signings alone will not solve everything after Brentford exposed familiar weaknesses on the opening weekend.

For Brentford, the focus will be on building momentum from an emphatic victory and seeing whether Sangare can continue making such a significant impact in midfield.

How worried should Tottenham supporters be after their 3-0 defeat to Brentford, despite the club's huge summer rebuild?