Below is a summary of the full article. Click here for the full version or go back to LFC Live.net
Newcastle United's unsettled forward Alexander Isak was seen returning to the Magpies' training ground on Monday.
The Swedish player started pre-season with the north east club but didn't participate in matches against Celtic or travel to Asia for their tour due to an injury.
It later came to light that Isak had asked to leave the club and explore opportunities elsewhere.
Meanwhile, Isak spent the previous week training in San Sebastian with his former club Real Sociedad, as the uncertainty over his future persists.
Speaking after his side's game against Tottenham, Howe sent a firm warning to Isak as he prepares to link up with his teammates.
Howe said: "He's like any other player, we would expect him to come in and train as normal." In response to queries about further contact from Liverpool, Howe mentioned: "Not as far as I know."
Howe openly acknowledged the issue when questioned about the implications of Isak skipping team training at Benton while the squad was back in Newcastle, suggesting it would be seen differently now.
Howe remarked: "Of course it is.
We're Newcastle United.
"The player has a responsibility here to be part of a team and part of a squad - you have to act in the right way.
"So that is also at play here
We will make sure that any player does that to earn the right to train with the group
No player can expect to act poorly and train with the group as normal."
For more news relating to Celtic, visit our sister site Celtic Latest Live.