Leeds United head coach Jesse Marsch has confirmed that Luis Sinisterra is ruled out until after the World Cup with a foot injury.
The 23-year-old was scheduled to return to first-team training this week after missing the 2-1 win against Liverpool in the Premier League last weekend.
However, Sinisterra will now miss Leeds' next two Premier League games against Bournemouth and Tottenham Hotspur before the World Cup break as scans have revealed that the Colombian winger has sustained a Lisfranc injury in his foot.
Sinisterra will join Stuart Dallas (leg) and Adam Forshaw (ankle) on the treatment table, while Marsch has revealed that youngster Archie Gray is set to begin training on Friday as he continues to recover from a foot injury.
Speaking at a press conference on Thursday ahead of Saturday's Premier League contest at home against Bournemouth, Marsch said: "Stuart (Dallas) and Adam (Forshaw) again are injured but making progress.
"Archie Gray will be, we think, on the pitch tomorrow, so starting to get closer to training with the full team, and then the only other update is Luis Sinisterra.
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"Luis has a foot injury that it turns out to be more than what we initially originally thought it was. He wasn't making the progress that we were hoping for him to make over the last 10 days. So they did another scan and then they had a specialist looked at it, and they start to worry about it being a Lisfranc injury.
"It's a rare injury that controls the movement of the metatarsals and when that is ruptured, it can be a long recovery. We don't believe it's ruptured. We believe it's partially torn, which puts him in a little bit of a grey area, but probably out until after the World Cup break.
"We'll know more about that today, and again we're hopeful that it's a version that doesn't take off for long."
The absence of Sinisterra is likely to see Crysencio Summerville, who turned 21 last Sunday, retain his place in the starting lineup following his dramatic 89th-minute winner on just his second Premier League start against Liverpool last weekend.
Marsch has heaped praise on the Dutch attacker, who also scored in the 3-2 defeat at home to Fulham, and believes that the youngster is 'understanding the process' of what it takes to establish himself as first-team player.
"[Summerville was] making sure that he was getting here early enough, making sure that that he was putting work in the gym, preparing for training the right way, paying attention in videos, applying the lessons that we wanted to learn in training every day.
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"Typically when he was playing with the Under-21s he was performing well. He's a gamer. He loves the match but it was more about helping him understand what the entire process of being a top professional is and making sure that he's committed to it.
"I talked after the game against Liverpool that a big factor for him is discipline, professionalism and work ethic.
"I've been on top of him again this week to make sure that he has a very good training week and he has. He has looked really good and we are hopeful that he can establish himself more and more."
March added: "I think he is a dangerous player. Is he going to score every game like he has in the last two? No. But I think he can be a big part of unbalancing teams, by scoring goals, by being good in transition and certainly good in pressing."
Leeds currently sit 15th in the Premier League table, with last weekend's win over Liverpool helping them climb out of the relegation zone, and a victory over 14th-placed Bournemouth could see them move up to 11th spot if other results were to go their way.
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