Arsenal blocks Kieran Tierney's January move to Celtic

Arsenal has decided to block Kieran Tierney's move to Celtic during the January transfer window, ensuring he stays with the Premier League club for the final six months of his contract. Although Tierney has agreed to a pre-contract that will see him return to Celtic on a free transfer this summer, Arsenal manager Mikel Arteta wants the defender to contribute to their title challenge and European campaign. Celtic had hoped to negotiate an early loan for Tierney, but with Arsenal's current squad needs, those plans have been quashed. As a result, Celtic is now exploring alternative left-back options for the remainder of the season. Tierney, who previously enjoyed great success at Celtic, will take a pay cut to rejoin his former club after his contract with Arsenal expires. The situation has left Celtic manager Brendan Rodgers assessing loan market opportunities to bolster his squad in the meantime.