Both players have made 43
senior club appearances this season, with Martins scoring seven goals and Carvalho on target twice.
The centre - back has made just 58
senior club appearances in a career that was already limited by injury before his two year jail term.
The 16 year old midfielder is clearly a player who is well thought of but given that Halilovic has only just made his first
senior club appearance it may be a little too early to be doling out the superlatives and unrealistic comparisons.
Not exact matches
The talented 19 - year - old has not yet become a full first - team regular for the Magpies, though he did make six
appearances for the
senior side last season, scoring two goals to attract some interest from bigger
clubs.
England Under 21 forward Will Keane is also on his way out having failed to add to his one
senior appearance for the
club, which was garnered back in December 2011.
The youngster has reportedly very impressive for his
club, and he must be doing something right as he has already made one subs
appearance for the Argentina
senior side, despite his tender age.
Nevertheless, it would still be a gamble for any
club who acquire his services, as Kokcu has yet to make a
senior appearance for the Eredivisie giants.
Despite only one La Liga
appearance for Barcelona's
senior side, young midfielder Oriol Romeu makes this list, though he largely flopped for both
clubs.
The 17 - year - old signed his first professional contract on December 13, and although he's only got one
senior appearance to his name, he has been making his mark for
club and country at youth level.
The Barca legend has been with the
club for over two decades, making 662
appearances for the
senior side and winning countless trophies, including eight La Liga titles and four Champions League trophies.
The 25 - year - old goal machine, who has netted 35 times in 41
club appearances so far this season, should be confirmed as a Chelsea player before the World Cup, where he is expected to add to his solitary
senior international cap for Spain.
He never managed a
senior league
appearance with the Citizens, and was sent out on five loan deals since moving to the
club seven years ago.
Marquinhos, a product of the Corinthians youth academy, joined the top five most expensive defenders ever after making only 44 44
senior appearances in his career, Rio Ferdinand, Thiago Silva, Lilian Thuram and Dani Alves are in this top five «
club».
In June 2011, Conor signed a new one - year deal at the
Club and six months later he made his
senior debut with a late substitute
appearance at Arsenal.
Although Samper did manage four
senior appearances for last season's treble winners, making his debut in the Champions League against Apoel, reports in Catalonia suggested he may move from his boyhood
club in search of regular first - team football.
Loftus - Cheek scored his first
senior goal for the
club in the FA Cup in January 2016 in another landmark substitute
appearance, this time against Scunthorpe.
The 19 - year - old is yet to make a
senior appearance for the French
club but has been involved during pre-season this summer.
Ederson has yet to make a
senior international
appearance and has only one season as a starting goaltender in a top - ranked
club.
Midfielder Tolisso has made six
senior international
appearances, five coming after he joined Bayern in a
club record $ 41.5 million switch from Lyon last summer.
He has since made nine
appearances for the
club's under - 23 team in the fourth division and one for the
senior team,...
But before we get to it, it's worth explaining that to be eligible for inclusion in this list players must have been in Manchester United's academy at some point and must have made their first
senior United
appearance during Van Gaal's time at the
club.
Klinsmann, the son of former Germany star and U.S. coach Jurgen Klinsmann, has made nine
appearances for Hertha's under - 23 team in the German fourth division and one for the
senior team, but he's behind former Bayern Munich goalkeeper Thomas Kraft, 29, and Norway international Rune Jarstein, 33, in the
club's pecking order.
Boufal made it to the
senior squad at Lille in the 2014 - 15 season after coming through the ranks at fellow French side Angers and has since gone on to make 43 Ligue 1
appearances for the
club, with a decent return of 14 goals and 10 assists to show for his efforts (stats via whoscored).