Belgian allrounder Wout van Aert, a key teammate of Tour de France leader Jonas Vingegaard, has left the race to be with his wife Sarah ahead of the birth of their second child.

Van Aert, a versatile rider capable of winning on all grounds, has provided crucial support to Vingegaard since the start of the Tour. But because Vingegaard has opened a huge gap in the general classification with one tough mountain stage left, Van Aert's presence was not deemed as essential.

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Wout van Aert in action

Belgiums Wout Van Aert climbs during the fifteenth stage of the Tour de France cycling race over 179 kilometers (111 miles) with start in Les Gets Les Portes du Soleil and finish in Saint-Gervais Mont-Blanc, France, Sunday, July 16, 2023.  (AP Photo/Daniel Cole)

"As everyone knows, Sarah is pregnant, things are starting to get a bit tight at home," Van Aert said in a video published by his Jumbo-Visma team ahead of Thursday's Stage 18. "In consultation with the team we have decided that my place is now at home."

Van Aert added that leaving the race is "a strange feeling, but it's not a dilemma."

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Wout van Aert in action

Denmarks Jonas Vingegaard, wearing the overall leaders yellow jersey, follows teammates Belgiums Wout Van Aert, left, and Sepp Kuss of the U.S., second left, during the seventeenth stage of the Tour de France cycling race over 166 kilometers (103 miles) with start in Saint-Gervais Mont-Blanc and finish in Courchevel, France, Wednesday, July 19, 2023.  (AP Photo/Daniel Cole)

Vingegaard, the defending champion, dropped Tadej Pogacar in the last big stage in the French Alps on Wednesday to increase his overall lead to 7 minutes, 35 seconds. Barring any big crash, he looks set to win his second Tour title on Sunday.

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Wout van Aert in action

Belgiums Wout Van Aert climbs as the Mont Blanc is seen in the background during the sixteenth stage of the Tour de France cycling race, an individual time trial over 22.5 kilometers (14 miles) with start in Passy and finish in Combloux, France, Tuesday, July 18, 2023.  (AP Photo/Thibault Camus)

Van Aert has nine career stage wins on the Tour, but none this month.

"I often had the legs to win a stage, but it did not happen," he said. "But I will always remember this Tour as the one where I called home every day."