Leyton Orient head coach Richie Wellens says goalkeeper Tommy Simkin has the potential to be better than last seen's on-loan stopper Josh Keeley.
Keeley kept 16 clean sheets in 45 matches while on from Tottenham last term and has since made a permanent move to Luton Town.
Simkin has been brought in on loan from Stoke City in his place and has played in all four of the O's League One games of the season so far and kept his second clean sheet in a 1-0 win against Plymouth Argyle on Tuesday.
"I think Tommy's been outstanding since the first moment he walked through the door," Wellens told BBC Radio London.