Irishman could be tested by the Ultimate Fighting Championship or the United States Anti-doping Agency.
The 22-year-old goalkeeper spent last season on loan at Mauricio Pochettino's side.
Mamadou Sakho, Lazar Markovic and Sheyi Ojo all left out of squad for Germany trip.
Mourinho says 'when the kids are good and have potential, there's no problem'.
Brazil international braced to complete £195m move to the French capital.
Former world number one has never previously missed a Grand Slam, but will not play at next month's US Open.
Tottenham are yet to sign a single player this summer.
Morata made his 'debut' for Chelsea in their 3-2 pre-season defeat by Bayern Munich.
Rooney is expected to start Everton's Europa League qualifier against Ruzomberok.
Tottenham Hotspur are also said to be interested in the 25-year-old midfielder.
City have reportedly denied making an eye-watering £143m bid for AS Monaco wonderkid.
Injured striker could yet earn a new short-term contract at Old Trafford despite being released in June.
Thirteen CSL clubs face a ban from the competition due to outstanding debts.
Jones will make his long-awaited return to the octagon at UFC 214 on Saturday (29 July).
Manchester City have reportedly spoken to Kylian Mbappe.
Reports in Germany suggest the club are now actively looking for a replacement.
Federer has won 19 men's singles Grand Slam titles - four more than Nadal in second.
Whites entitled to compensation for player under 24 who was offered fresh terms before leaving for Turf Moor.
Van Dijk has been left out of Southampton's squad for their pre-season trip to France.
Depay joined Lyon after spending one-and-a-half years at Old Trafford in January this year.
Lemar is set to be Arsenal's third signing of the summer transfer window.
Neymar, 25, has been linked with a mega-money move to Paris Saint-Germain.
Madrid have reportedly agreed a €180m (£160.9m, $209.8m) fee for the young Frenchman.
Mbappe will not join Real if he has to play alongside Ronaldo, Bale and Benzema.
Barcelona are yet to agree a fee with Liverpool after their initial £72m offer was rejected.
A move to Old Trafford was reportedly sanctioned by Blues owner Roman Abramovich.
IBTimes UK have already revealed Deportivo have tabled a £9m bid to re-sign him.
The tennis star is fighting a multi-million dollar lawsuit after a car crash in early June.
'Chicharito' is back in the Premier League after completing £16m move from Bayer Leverkusen to West Ham.
Brown becomes Brighton's sixth signing of the summer ahead of the coming season.