Middlesbrough manager Neil Warnock believes players refusing to be vaccinated against COVID-19 are acting irresponsibly.
The 72-year old was speaking ahead of Boro's Championship meeting with Queens Park Rangers on Wednesday.
Warnock was forced to isolate in September of 2020 having contracted the virus himself.
On Monday, the Premier League confirmed its highest number of infections (11) since January in their latest rounds of testing.
Some managers, like Manchester United's Ole Gunnar Solskjaer, admitted their players are "not sure" about the vaccine, which greatly reduces the risk of coronavirus transmission.
Warnock said players putting off getting vaccinated puts the football season - as a whole - at risk.
"Obviously it's important that everybody has two injections if they can, to solve that," he said, "You know we're doing tests on some of the players this morning, only the ones who haven't had two injections.
The gaffer’s had his first dose of the vaccine 💪💉
“I'd urge everyone to go and get it when it's your turn. Hopefully this is the start of us being able to get back to some normality again” #UTB pic.twitter.com/XueAk8WDug
— Middlesbrough FC (@Boro) February 15, 2021
"I just can't see the logic in not having them so I think there will be some disruption from the season.
"You know it does worry you because if we lost two or three players with it now then we'd be in a right situation with the lads that are injured as well so I just don't see the logic.
"We are trying to get the lads to have injections if I'm honest, the vaccinations."
Asked if most of his Middlesbrough players were vaccinated, Warnock replied, "No.
"Obviously it's personal choice, I don't know where they're getting their advice from, like I say, but I think it's the wrong advice.
"It's not just for themselves, it's what they could do to other people if they have it. They don't realise the importance.
"You know, one or two lads will be going home this weekend cos we've not had a midweek [game], so who's to say they don't go down to London and see their grandparents or what have you and if they caught it, I just think it's irresponsible but that's how I am."