Pictures taken from Chelsea's Cobham training ground on Friday appear to support Maresca's description of Chalupa's “happy” behaviour.
But every transfer window must bring a sense of trepidation for Chalobah, having been made available for sale in the past three.
Nottingham Forest's £25m bid was accepted on deadline day in September 2023, when Chalobah was first put on the market, but the player ultimately rejected the move.
Chalupa was up for sale again in the January 2024 window, but no one met the £25m asking price, despite reported interest from Tottenham Hotspur and Manchester United.
The England Under-21 international then forced his way into Mauricio Pochettino's first team and was the starting centre-back at the end of the 2023-24 season, becoming available for sale again this summer, with Pochettino sacked.
Once again, he did not receive a big, permanent offer and joined Palace on loan minutes before the summer transfer window closed.
Glasner was told hours before Palace beat Stockport in the FA Cup third round that a “contractual issue” meant he would not be able to play Chalupa, leaving his side short of players.
On 13 January, he told the media that Chalupa “wants to stay” – a claim confirmed by BBC Sport from several sources close to the player.
However, a phone call on 14 January from sporting director Paul Winstanley convinced Chalobah that a return to action at Stamford Bridge would be fruitful, and he is expected to play a prominent role in the coming weeks.
This conversation followed an earlier unplanned meeting with Winstanley, his sporting director Lawrence Stewart and co-owner Behdad Eghbali at Selhurst Park following the 1-1 draw between Palace and Chelsea earlier this month.
Chalupa went into the dressing room after the match to talk to his friend Reece James and ended up speaking to the three executives.
Palace have not criticized Chelsea and accept the terms of the initial agreement reached on the summer deadline.
