All doping tests at the World Cup have been negative, FIFA said on Thursday.

Since January, 2,037 tests have been conducted by FIFA, national anti-doping agencies and confederations.

There were a total of 3,985 samples collected by FIFA in unannounced controls before the World Cup and 626 during the tournament. They included 108 collected on non-matchdays.

On average, every player from the four semi-finalists - France, Croatia, Belgium and England - were tested 4.41 times since January.

"For the 2018 FIFA World Cup, every participating player was tested in unannounced controls before the competition and further systematic tests have been performed during it, both with post-match controls and on non-matchdays," a statement said.

All samples were analysed at World Anti-Doping Agency (WADA)-accredited laboratories in the largest testing programme ever conducted for a World Cup. All of the samples collected during the competition were carried out at the laboratory in Lausanne, Switzerland.

FIFA said it developed a test distribution plan (TDP) based on an analysis of doping risks for football. The TDP was shared and agreed with WADA and was based on an intelligence-based testing programme.