Liverpool’s 2017-18 Premier League campaign got off to the worst possible start when they conceded within 10 minutes of their match against Watford.Defending from corners was a real problem for the Reds last season and Liverpool fans would have hoped that Jurgen Klopp had prioritised set-piece defending during the pre-season.But wouldn’t you know it, Watford’s goal came from a corner.Jose Holebas sent in a perfect delivery that was met by Stefano Okaka, who, unmarked, headed home from yards out.It was woeful defending. Okaka ghosted in ahead of Roberto Firmino and Simon Mignolet had no chance of keeping his header out.

Watch: Okaka's goal

New season, same old story for Liverpool.

Lineker reacted on Twitter

Liverpool fans vented their anger on Twitter but Gary Lineker reacted with a more humorous tweet.

“Liverpool concede to a Watford corner,” the Match of the Day host wrote on social media.

“If that had been a weakness last season they'd have had time to work on it...oh wait a minute.”

Shearer responded

Lineker’s BBC Sport colleague Alan Shearer responded by suggesting that Southampton could make it even more difficult for Liverpool to sign Virgil van Dijk, who has handed in a transfer request at St. Mary’s.

Shearer wrote: “Van Dijk valuation just gone up another 15 million!”

Liverpool have the height to be useful both defending and attacking set-pieces as former Liverpool player Phil Thompson explained back in April.

"Jurgen Klopp likes to zonal mark so if I was him going into the game I'd go three at the back to get a bit more height into the side,” Thompson told Sky Sports.

“Divock Origi will probably also need to play to add some height, so you'd have him plus Ragnar Klavan, Joel Matip and Dejan Lovren all strong in the air.”

It beggars belief why Klopp didn’t have one of his centre-backs - Matip and Lovren started at Vicarage Road - pay attention to the sturdy Okaka.

Don’t be surprised if the German makes a stronger push to sign Van Dijk next week.

Should Liverpool go all out to sign Van Dijk - or should they target someone else? Let us know in the comments section below!