Land borders are closed with Serbia and train stations in the country are crowded as large groups of migrants try to get to Zagreb by train or bus.

Croatia has shut most of its road border crossings with Serbia, claiming it is unable to cope with the migrant influx of more than 11,000 people.

On Friday, railway stations at Tovarnik, on the Croatian side of the border, Beli Manastir, close to the border with Hungary, saw hundreds waiting for trains to Zagreb.

In and around Zagreb, reception and registration centres have been set up, including one at Zagrab Fair, an exhibition centre. Authorities have been shuttling some of the migrants to these centres.

"Disruption and delays are possible at rail and road border crossings with Serbia, Hungary and Slovenia, as a result of significant numbers of people seeking to transit Croatia," advice from the Foreign Office states.

"The situation can change quickly. Air traffic has not been affected so far. The Croatian coast is also unaffected."

It recommends that travellers monitor local and international media and check with transport providers; the Croatian Railways website (only in Croatian) or the Deutsche Bahn (German Federal Railway which covers all Croatian railways in English), as well as websites in English of the Croatian Automobile Association (HAK) and the Croatian Interior Ministry (MUP) for updates.

The Croatian Tourist Board said that organised accommodation at seven different locations within the country is being provided for a "significant wave" of refugees.

"Therefore, in Croatian cities including Zagreb, tourist resorts and Croatian tourist destinations will continue to function as normal. We are aware, however, that some border crossings may be delayed or limited due to the continued efforts to manage the situation.”

. A family waits to board a train from Zagreb to Germany

Elsewhere in Europe

Slovenia

The country’s interior ministry has said that it expects around 1,000 migrants to arrive by Saturday, mainly from Zagreb.

Trains to Ljubljana from Zagreb may be affected as it is unclear how long the border with Croatia will remain open.

Around 100 people were being held Friday at a makeshift processing centre in the border town of Berizce.

Hungary

International train services from Budapest Keleti train station have now resumed following recent disruption.

The Foreign Office advises travellers to “continue to monitor local media, and check with your carrier and the Hungarian Railways (MÁV) website (mavcsoport.hu/en) for updates.

“Since the end of August 2015 there has been considerable disruption to rail and road transport from Budapest to the Austrian border. This is due to police and border enforcement action as a result of significant numbers of people seeking to transit through Hungary,” its website states.

• Migrant crisis: advice for city breaks in Budapest

Around 7,000 migrants are in Kos, waiting to be moved to Athens Photo: GETTY

Kos

“There has been an increase in the number of migrants arriving on some Greek islands, including Kos,” said the Foreign Office. “The British Embassy is keeping the situation under review, but at present there are no reports of any specific risks to British nationals visiting these islands.”

Marc Dubin, Telegraph Travel's Greece expert, who lives on Samos, another island affected by the crisis, said: "The situation threatened to overwhelm local resources during late summer, but there are indications of improving conditions since September 1, thanks in part to initiatives by both private parties and European officials.

“Since July, refugees have been housed in tents along the shore promenade of the main town, between the yacht marina and the medieval castle,” he said. “Normally this is where the tourist-friendly pedestrian walkway and cycle path are. However, Kyriaki Zika of the Hotel Afendoulis, one block inland from the affected area, says they have not greatly impinged on tourism and that personally she has only had one recent cancellation explicitly related to the refugees."

• Greece migrant crisis: Should I visit Kos?

There have been no reports of any holidaymakers being harassed in any way by the new arrivals Photo: GETTY

Lesbos

Migrants are still arriving though visitors and those working with refuges say the situation has calmed down. Greek officials and other bodies have moved 29,000 people through an expedited registration process, with extra ferries running 24 hours a day in order for them to quickly transit off the island, said Rescue-uk.org.

Many refugees have been able to transit through Lesbos in less than 24 hours, with 2-3,000 leaving a day.