The duo have both been offered new deals to extend their stay at Firhill beyond this summer but SportTimes understands they are both likely to hold off putting pen-to-paper until they have evaluated their options next year.
Jags boss Alan Archibald has tied down a number of his first-team stars in recent months, with the likes of Scott Fox, Conrad Balatoni, Stuart Bannigan and skipper Sean Welsh committing their long-term futures to the SPFL Premiership club.
Thistle are eager to tie down two of their most important players, and valuable assets, for years to come but forward Lawless and left-back Taylor-Sinclair have so far stalled on signing on the dotted line. Both were integral parts of the Jags side that claimed the First Division title last season.
Lawless enjoyed a terrific campaign last time out after being brought to Firhill by former boss Jackie McNamara and was the subject of a bid from Dutch side Willem II in the summer, with Thistle turning down a significant five-figure sum for the 22-year-old, who has three goals to his credit already this season.
Taylor-Sinclair was named in the PFA First Division Team of the Year and has been watched by clubs from both sides of the border since making the move from League Two outfit Montrose in July 2011.
The Jags pair are likely to have a string of suitors next summer, when they will be available on free transfers, with both players now seemingly content to see what is on the table before deciding whether to sign on again with Archibald's side.
Meanwhile, the funeral of former Firhill favourite John Flanagan will take place at Craigton Crematorium tomorrow.
Flanagan, who also played for St Johnstone and Clyde, made 184 appearances and scored 40 times during his five-year stint at the club.