The Trek-Segafredo team has pulled Pieter Weening from Wednesday's fifth stage of the Giro d'Italia to Camigliatello Sirano after he continued to suffer from "mild vertigo" from a crash on stage 4.

The 39-year-old Dutchman was considered a key domestique for Vincenzo Nibali, but the Trek-Segafredo team is now down to seven riders.

Weening only joined Trek-Segafredo on June 5 and had no team early in the 2020 season before the COVID-19 pandemic. His previous team, Loompot-Charles, disbanded at the end of 2019, but he continued training and signed with the Trek-Segafredo team for a busy readjustment season.

Weening crashed heavily on stage 4, Villafranca Tirrena, after receiving a biden from Soinier along the roadside. He lost control of his bike and became entangled in the frame.

He got up to finish the stage and Trek-Segafredo announced that he had suffered the usual scrapes.

However, midway through the 225-km stage in the hills of Calavia, Trek-Segafredo announced that Weening was out of the race.

"The team has decided to withdraw @WeeningPieter from the race after feeling mild dizziness during the stage." Trek Segafredo wrote on social media.

"The Dutchman was closely monitored yesterday, tonight and this morning and conditions allowed him to start.

"In the next few hours he will undergo a clinical examination.

Speaking to De Telegraaf on Tuesday, Weening complained about the current Bidon design, which has caused several crashes at the Giro d'Italia.

On Monday, Geraint Thomas (Ineos Grenadiers) crashed in the neutral sector after hitting Bidon, which had fallen off another rider's bike. He completed the stage to Mount Etna but did not start stage 4 after an examination revealed a fractured pelvis.

"Full bottles are like running on bricks; you can't stop," Weening said. [Previously, they had pressure caps and they were falling apart. Now it's a screw cap, so that doesn't happen anymore. If it rolls off into the peloton, it's deadly.

Weening is the sixth rider to abandon this year's Giro d'Italia.

Miguel Angel Lopez crashed in the opening time trial in Palermo. Luca Covilli (Bardiani-CSF) and Alexandre Vlasov (Astana) abandoned, and Luca Wackermann did not start stage 5 after a low-flying helicopter blew out his metal barrier. He sustained multiple injuries, including concussion.