Wales striker Ched Evans, a half-time substitute in the 2-0 defeat to England, Malta forward Daniel Bogdanovic, Norway midfielder Bjorn Helge Riise and Australia defender Shane Lowry all returned to Bramall Lane unscathed.
Adams said: "It's great to have the lads back, as a manager you always worry that players will return from international duty with a knock.
"But they have been in and trained with the rest of the squad.
"We are now looking forward to a good week on the training ground this week ahead of what will be a big game at QPR on Monday."
Source: PA
Source: PA