England football team took their training to next level as the millionaire squad went through Royal Marines drills ahead of Scotland clash.

According to Sportsmail, manager Gareth Southgate organised a secret trip to a Royal Marines training camp in Devon to prepare for the Scotland clash.

But, in what is a significant climbdown, the squad were allowed to leave the England camp on Sunday night before reconvening at St George's Park on Tuesday.

In November, the Football Association launched a crackdown on allowing squad members nights off while on international duty as a result of Wayne Rooney's infamous late night at the Grove Hotel ahead of a friendly against Spain.

But Southgate has relaxed his stance by allowing his stars to return to their families for two nights before returning for an evening training session.

Since his appointment as permanent England manager in November, Southgate has tried to implement innovative training techniques.

The 48-hour camp was designed as a team-bonding exercise, the confiscation of players' phones viewed as a means to bring the squad closer together.

The players, who met up at St George's Park on Friday, were shocked to discover they would be heading to the Royal Marines' commando training centre near Exeter. In an attempt to take them out of their comfort zone, the players were put through a number of drills, including a four-mile hike with 21kg on their backs.

The squad then spent the night camping on Woodbury Common, a far cry from the comfortable surroundings of St George's.

Gary Cahill, Eric Dier, Chris Smalling, Jesse Lingard and Marcus Rashford were unavailable for the trip and will meet up with the rest of the squad on Tuesday.

Southgate's on-field preparations for Saturday's clash at Hampden Park begin on Tuesday.

Harry Kane is expected to lead the line for Southgate for the first time and Cahill is set to return in central defence after missing the win over Lithuania in March through suspension.