Martinelli came on as a second-half substitute during United Youth XI's 2-0 win over Lincoln U18's.
Neymar is believed to be closing in on completing a move to PSG this summer.
Redmond scored four goals for the United reserves last season.
The biggest card of the year takes place on Saturday (29 July).
Alli was the Premier League's highest scoring midfielder last season.
South Africa collapse, with Roland-Jones taking four wickets on debut.
Giroud, 30, has attracted interest from a host of clubs.
La Liga president Javier Tebas insists financial fair play regulations are being breached.
Reports suggest Hammers playmaker could fill the void left by the Brazilian.
Anderlecht chief Herman Van Holsbeeck feels Dendoncker has the ability to reach the top of European football.
The Netherlands international is reportedly eager to work under Jurgen Klopp at Anfield.
Catalans are expected to launch an £80m bid to sign the Liverpool ace.
Midfielder joined Crystal Palace earlier this month for his first loan stint away from Stamford Bridge.
The Brazil international remains content with life with the Reds despite reports terms have been agreed.
Out-of-favour Spanish forward looking to return to Galicia after wretched season with the Gunners.
"Competition can only be good for me and for the team," says left wing-back.
Chelsea have completed four signings thus far this summer - Caballero, Rudiger, Bakayoko and Morata.
Mahrez and Barkley are primed for moves this summer.
Mauricio Pochettino considering to promote Walker-Peters after selling Kyle Walker to Manchester City.
The Premier League champions have made three signings so far this summer.
West Ham United could pursue a move for the England international.
Sport says that the La Liga giants are now considering making an offer to sign the Frenchman.
Mundo Deportivo says that the Reds could pay between €30m (£26.8m, $35.1m) and €40m to win the race.
Antonio Conte did enquire about Portuguese midfielder, according to CEO Karl-Heinz Rummenigge.
Jose Mourinho is desperate to add a wide player to his squad this summer.
Former Gunners forward Alan Smith sees Sanchez as a 'big shadow' over the Emirates Stadium.
Saunders thinks Reds should part with Coutinho for £100m.
Spaniard has missed the first two pre-season games against Manchester United and City due to a fitness issue.
Inter Milan were believed to be targeting the Senegal international as a potential replacement for Perisic.
Chief-executive Marco Fassone admits big-spending Rossoneri did visit Costa's representative.