Villar was provisionally suspended by the FEI on September 29 after his horse LG Muneerah tested positive for a banned substance during a CEI2* event in August.

Villar had ridden the horse to victory in the endurance event in Trinidad in Uruguay but a sample taken after the race revealed traces of Guanabenz, a sedative with analgesic effect.

The substance is on the FEI’s prohibited Ssubstances list and, following the completion of the disciplinary process, the governing body have handed Villar a two-year ban and fined him CHF 2,000 (£1,500/$2,000/€1,800)

He was also ordered to contribute CHF 1,500 (£1,160/$1,500/€1,400) towards the cost of the judicial procedure.

Villar's suspension came into effect on the date of notification and is due to last until June 22 next year. 

Shekofti has also received a two-year sanction after his horse Sir de Diamant, which has been suspended for two months, produced an adverse analytical finding following the CSIO2 jumping event in Tehran.

The samples taken at the competition, which took place from September 22 to 25, returned stanozolol and its metabolite, 16 Beta Hydroxy-Stanozol, an anabolic steroid which promotes muscle mass.

Additionally, the controlled medication substance dexamethasone, a corticosteroid used to treat inflammatory and auto-immune conditions, and the non-steroidal anti-inflammatory drug flunixin were also detected.

His provisional suspension, which came into effect on 16 November in 2015, was credited against the period of ineligibility, leaving his sanction running until November 15 next year.

Shekofti was ordered to pay CHF 2,000 (£1,500/$2,000/€1,800) and contribute CHF 2,000 towards the cost of the procedure.

Both Villar and Shekofti have been given 21 days to appeal the rulings of their cases to the Court of Arbitration for Sport.

The FEI have confirmed an adverse analytical finding was discovered following a test on the horse Dendros at the CPEDI3* in Somma Lombardo on June 19.

The horse was ridden to sixth place in the Para-equestrian dressage event by Klausener, but tested positive after competition for the banned substance demecolcine.

Demecolcine, used as a rheumatic treatment and in chemotherapy, is banned under FEI rules.

Klausener has been handed a provisional suspension as a result, while the horse is currently suspended for two months.

The Swiss rider could still compete at the Rio 2016 Paralympic Games, should he succeed in having the provisional suspension lifted at a hearing.

"The athlete has the opportunity to ask for a preliminary hearing to request the lifting of the provisional suspension, and this can be convened at short notice," an FEI spokesperson told insidethegames.

"Should the request to lift the provisional suspension be granted, that would allow the athlete to compete prior to a full hearing before the FEI Tribunal."