With international football taking place well into June, many of our senior internationals are not due to return to the Club until later in July.
However, those who did return - including FIFA Under-20 World Cup winners Josh Onomah and Kyle Walker-Peters - were in great spirits.
Harry Winks was also spotted as he continues on the comeback trail following the ankle injury he suffered at the start of April.
Check out our photo gallery here.
As usual on the first day back, medical testing was very much to the fore with a host of drills for the players to undergo, including the usual sub-max VO2 testing which measures oxygen uptake and the reaction lights circuit.
Following some initial sessions last week, our development squad and Under-18s players returned full-time yesterday (Sunday).
The lads were all sporting our new range of Nike training wear – pick up yours from our online store now.