Arjen Robben's coach at Groningen, Danny Buijs, refused to rule out the possibility that the Dutch winger may retire following his latest injury setback.
The former Bayern, PSV and Real Madrid star was making his competitive debut at his first club, after scoring in his first friendly appearance last weekend against Arminia Bielefeld for his first goal there since 28 April, 2002.
In his return to the Eredivisie, in the 29th minute, he made a challenge for the ball but immediately signalled to the bench and he stormed off, throwing down his jersey in frustration.
Robben has been plagued with hamstring problems throughout his career, leading to him being dubbed 'The Glass Man' due to his injury propensity.
He said last month: "I want to get even fitter before I start competitions. I had a very good training week, where I was able to do things to 100 per cent.
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But it is unclear whether Robben will be able to, or want to, make a full comeback at the age of 36, knowing the rehabilitation needed to return.
Buijs said: "I have not yet spoken to him, I don't know exactly what it is, but he said problems in the groin area.
"This boy has worked so hard. When the game ends like this, it is very frustrating for him."
The Groningen fans had unfurled a 'Welcome Home, Arjen' banner for Robben prior to kick-off, while there were even suggestions that a return to form could lead to more international caps.
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