The Roma forward has taken in another loan spell in Switzerland in order to find regular football again.
The Belgian striker has been linked with a move to the Premier League this summer.
Leeds United returned to pre-season training yesterday morning.
Glasgow Rangers boss Mark Warburton is preparing his side for their first season back in the Scottish Premiership.
The midfielder has been heavily linked with Liverpool in recent months.
Celtic's squad have been in training with Brendan Rodgers for over a week now.
Tottenham are going on a short pre-season visit of Australia at the end of July to play high profile friendlies against Juventus and Atletico Madrid.
Marcus Antonsson has penned a new three-year contract at Leeds United.
West Ham are keen to add a striker to their squad this summer.
The Belgian defenders have been in good form in France.