West Ham are reportedly keen to sign Chelsea goalkeeper Thibaut Courtois, who is currently on loan with La Liga club Ateltico Madrid.
Courtois signed for Chelsea from Belgian side Genk in the summer of 2011, before moving to Atletico Madrid on loan following the departure of David de Gea to Manchester United.
The 20-year-old made 51 appearances in all competitions as Atletico won the Europa League and impressed enough for Chelsea to allow him to spend another season in Madrid.
Courtois is surely destined to become Petr Cech's eventual replacement at Chelsea, but West Ham reportedly want to lure the Belgium international away from Stamford Bridge.
According to The Sun, West Ham are considering a move for Courtois, who will return from duty with Atletico Madrid in June.
West Ham lost long-term No.1 Robert Green to Queens Park Rangers during the summer transfer window, and replaced him with veteran goalkeeper Jussi Jaaskelainan.
But the Hammers will surely be looking for a replacement for the 37-year-old given his advanced years, and Chelsea youngster Courtois seemingly fits the bill for Allardyce.